Image picker meta data corrections (firebase#1586)

* iOS: Using first byte to determine original image type. (Only JPEG and PNG)
* iOS: Added XCTest target.
* iOS: The picked image now has the correct EXIF data copied from the original image.

AUTHORS

@@ -33,4 +33,5 @@ EUI Limited <[email protected]>
 Katarina Sheremet <[email protected]>
 Thomas Stockx <[email protected]>
 Sarbagya Dhaubanjar <[email protected]>
-Ozkan Eksi <[email protected]>
+Ozkan Eksi <[email protected]>
+ko2ic <[email protected]>

packages/firebase_messaging/example/ios/Runner.xcodeproj/project.pbxproj

@@ -9,7 +9,6 @@
 /* Begin PBXBuildFile section */
 		2EF3EFF8E25860E112E91756 /* libPods-Runner.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 799CAB03D87EEEE1FF65E7BE /* libPods-Runner.a */; };
 		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
-		2D5378261FAA1A9400D5DBA9 /* flutter_assets in Resources */ = {isa = PBXBuildFile; fileRef = 2D5378251FAA1A9400D5DBA9 /* flutter_assets */; };
 		3B80C3941E831B6300D905FE /* App.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; };
 		3B80C3951E831B6300D905FE /* App.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 3B80C3931E831B6300D905FE /* App.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		5C5A74FB1EAA74D700FE37CF /* GoogleService-Info.plist in Resources */ = {isa = PBXBuildFile; fileRef = 5C5A74FA1EAA74D700FE37CF /* GoogleService-Info.plist */; };
@@ -42,7 +41,6 @@
 
 /* Begin PBXFileReference section */
 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
-		2D5378251FAA1A9400D5DBA9 /* flutter_assets */ = {isa = PBXFileReference; lastKnownFileType = folder; name = flutter_assets; path = Flutter/flutter_assets; sourceTree = SOURCE_ROOT; };
 		3B80C3931E831B6300D905FE /* App.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = App.framework; path = Flutter/App.framework; sourceTree = "<group>"; };
 		5C5A74FA1EAA74D700FE37CF /* GoogleService-Info.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = "GoogleService-Info.plist"; sourceTree = "<group>"; };
 		5C8223BE1EC265DD00E12B15 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
@@ -89,7 +87,6 @@
 			children = (
 				3B80C3931E831B6300D905FE /* App.framework */,
 				3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */,
-				2D5378251FAA1A9400D5DBA9 /* flutter_assets */,
 				9740EEBA1CF902C7004384FC /* Flutter.framework */,
 				9740EEB21CF90195004384FC /* Debug.xcconfig */,
 				7AFA3C8E1D35360C0083082E /* Release.xcconfig */,
@@ -223,7 +220,6 @@
 				97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */,
 				9740EEB51CF90195004384FC /* Generated.xcconfig in Resources */,
 				3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */,
-				2D5378261FAA1A9400D5DBA9 /* flutter_assets in Resources */,
 				9740EEB41CF90195004384FC /* Debug.xcconfig in Resources */,
 				97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */,
 				97C146FC1CF9000F007C117D /* Main.storyboard in Resources */,