CB-12542: (ios) Fix wav file recording, add m4a extension. make IOS status handling compatible with Android/Windows

implement a "messageChannel" command and if the messageChannel
command is called  the plugin hands back results to the plugin
container via "sendPluginResult" instead of "evalJs"
even for oldschool usage it cleans the code

Closes #134.

Author: Leo Schubert

README.md

@@ -558,7 +558,7 @@ function recordAudio() {
 
 ### iOS Quirks
 
-- iOS only records to files of type _.wav_ and returns an error if the file name extension is not correct.
+- iOS only records to files of type _.wav_ and _.m4a_ and returns an error if the file name extension is not correct.
 
 - If a full path is not provided, the recording is placed in the application's `documents/tmp` directory. This can be accessed via the `File` API using `LocalFileSystem.TEMPORARY`. Any subdirectory specified at record time must already exist.
 

src/ios/CDVSound.h

@@ -87,10 +87,12 @@ typedef NSUInteger CDVMediaMsg;
     NSString* currMediaId;
     AVAudioSession* avSession;
     AVPlayer* avPlayer;
+    NSString* statusCallbackId;
 }
 @property (nonatomic, strong) NSMutableDictionary* soundCache;
 @property (nonatomic, strong) AVAudioSession* avSession;
 @property (nonatomic, strong) NSString* currMediaId;
+@property (nonatomic, strong) NSString* statusCallbackId;
 
 - (void)startPlayingAudio:(CDVInvokedUrlCommand*)command;
 - (void)pausePlayingAudio:(CDVInvokedUrlCommand*)command;
@@ -110,7 +112,7 @@ typedef NSUInteger CDVMediaMsg;
 - (CDVAudioFile*)audioFileForResource:(NSString*)resourcePath withId:(NSString*)mediaId doValidation:(BOOL)bValidate forRecording:(BOOL)bRecord;
 - (CDVAudioFile*)audioFileForResource:(NSString*)resourcePath withId:(NSString*)mediaId doValidation:(BOOL)bValidate forRecording:(BOOL)bRecord suppressValidationErrors:(BOOL)bSuppress;
 - (BOOL)prepareToPlay:(CDVAudioFile*)audioFile withId:(NSString*)mediaId;
-- (NSString*)createMediaErrorWithCode:(CDVMediaError)code message:(NSString*)message;
+- (NSDictionary*)createMediaErrorWithCode:(CDVMediaError)code message:(NSString*)message;
 
 - (void)startRecordingAudio:(CDVInvokedUrlCommand*)command;
 - (void)stopRecordingAudio:(CDVInvokedUrlCommand*)command;