adding LeakCanary

Author: tibbi

app/build.gradle

@@ -19,10 +19,14 @@ android {
     }
 
     buildTypes {
+        debug {
+            buildConfigField "boolean", "USE_LEAK_CANARY", "true"
+        }
         release {
             minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
             signingConfig signingConfigs.release
+            buildConfigField "boolean", "USE_LEAK_CANARY", "false"
         }
     }
 
@@ -36,12 +40,19 @@ android {
     }
 }
 
+ext {
+    leakCanaryVersion = '1.5.4'
+}
+
 dependencies {
     compile 'com.simplemobiletools:commons:2.38.2'
     compile 'com.bignerdranch.android:recyclerview-multiselect:0.2'
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
 
     compile files('../libs/RootTools.jar')
+
+    debugCompile "com.squareup.leakcanary:leakcanary-android:$leakCanaryVersion"
+    releaseCompile "com.squareup.leakcanary:leakcanary-android-no-op:$leakCanaryVersion"
 }
 
 buildscript {

app/src/main/kotlin/com/simplemobiletools/filemanager/App.kt

@@ -2,12 +2,20 @@ package com.simplemobiletools.filemanager
 
 import android.app.Application
 import com.github.ajalt.reprint.core.Reprint
+import com.simplemobiletools.filemanager.BuildConfig.USE_LEAK_CANARY
 import com.simplemobiletools.filemanager.extensions.config
+import com.squareup.leakcanary.LeakCanary
 import java.util.*
 
 class App : Application() {
     override fun onCreate() {
         super.onCreate()
+        if (USE_LEAK_CANARY) {
+            if (LeakCanary.isInAnalyzerProcess(this)) {
+                return
+            }
+            LeakCanary.install(this)
+        }
 
         if (config.useEnglish) {
             val conf = resources.configuration