Update Language implementation

* Move Language implementation to new group without folder
* Update copyright text on each Language implementation file
* Move all OSUD_LANGUAGE and DEFAULT_LANGUAGE defines to LanguageContext.h

Author: tanaynigam

iOS_SDK/OneSignalSDK/Source/Language/LanguageContext.h

@@ -0,0 +1,44 @@
+/**
+ * Modified MIT License
+ *
+ * Copyright 2021 OneSignal
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * 1. The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * 2. All copies of substantial portions of the Software may only be used in connection
+ * with services provided by OneSignal.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#import <Foundation/Foundation.h>
+#import "LanguageProvider.h"
+
+#define OSUD_LANGUAGE                                                       @"OSUD_LANGUAGE"                                                    // * OSUD_LANGUAGE
+#define DEFAULT_LANGUAGE                                                    @"en"                                                               // * OSUD_LANGUAGE
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface LanguageContext : NSObject
+
+- (void)setStrategy:(NSObject<LanguageProvider>*)strategy;
+
+@property (nonatomic, nonnull)NSString* language;
+
+@end
+
+NS_ASSUME_NONNULL_END

iOS_SDK/OneSignalSDK/Source/Language/LanguageContext.m

@@ -0,0 +1,58 @@
+/**
+ * Modified MIT License
+ *
+ * Copyright 2021 OneSignal
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * 1. The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * 2. All copies of substantial portions of the Software may only be used in connection
+ * with services provided by OneSignal.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#import "LanguageContext.h"
+#import "LanguageProvider.h"
+#import "OneSignalUserDefaults.h"
+#import "OneSignalHelper.h"
+#import "LanguageProviderDevice.h"
+#import "LanguageProviderAppDefined.h"
+
+@implementation LanguageContext {
+
+    NSObject<LanguageProvider> *strategy;
+}
+
+- (instancetype)init {
+    self = [super init];
+    let languageAppDefined = [OneSignalUserDefaults.initStandard  getSavedStringForKey:OSUD_LANGUAGE defaultValue:nil];
+    if (languageAppDefined == nil) {
+        strategy = [LanguageProviderDevice new];
+    } else {
+        strategy = [LanguageProviderAppDefined new];
+    }
+    return self;
+}
+
+- (void)setStrategy:(NSObject<LanguageProvider>*)newStrategy {
+    strategy = newStrategy;
+}
+
+- (NSString *)language {
+    return strategy.language;
+}
+@end

iOS_SDK/OneSignalSDK/Source/Language/LanguageProvider.h

@@ -0,0 +1,32 @@
+/**
+ * Modified MIT License
+ *
+ * Copyright 2021 OneSignal
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * 1. The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * 2. All copies of substantial portions of the Software may only be used in connection
+ * with services provided by OneSignal.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+@protocol LanguageProvider <NSObject>
+
+@property (readonly, nonnull)NSString* language;
+
+@end