Obj-C SDK Cleanup

This CL separates the files under sdk/objc into logical directories, replacing
the previous file layout under Framework/.

A long term goal is to have some system set up to generate the files under
sdk/objc/api (the PeerConnection API wrappers) from the C++ code. In the shorter
term the goal is to abstract out shared concepts from these classes in order to
make them as uniform as possible.

The separation into base/, components/, and helpers/ are to differentiate between
the base layer's common protocols, various utilities and the actual platform
specific components.

The old directory layout that resembled a framework's internal layout is not
necessary, since it is generated by the framework target when building it.

Bug: webrtc:9627
Change-Id: Ib084fd83f050ae980649ca99e841f4fb0580bd8f
Reviewed-on: https://webrtc-review.googlesource.com/94142
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Commit-Queue: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24493}

sdk/objc/Framework/Headers/WebRTC/UIDevice+RTCDevice.h

@@ -8,74 +8,4 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#import <UIKit/UIKit.h>
-
-typedef NS_ENUM(NSInteger, RTCDeviceType) {
-  RTCDeviceTypeUnknown,
-  RTCDeviceTypeIPhone1G,
-  RTCDeviceTypeIPhone3G,
-  RTCDeviceTypeIPhone3GS,
-  RTCDeviceTypeIPhone4,
-  RTCDeviceTypeIPhone4Verizon,
-  RTCDeviceTypeIPhone4S,
-  RTCDeviceTypeIPhone5GSM,
-  RTCDeviceTypeIPhone5GSM_CDMA,
-  RTCDeviceTypeIPhone5CGSM,
-  RTCDeviceTypeIPhone5CGSM_CDMA,
-  RTCDeviceTypeIPhone5SGSM,
-  RTCDeviceTypeIPhone5SGSM_CDMA,
-  RTCDeviceTypeIPhone6Plus,
-  RTCDeviceTypeIPhone6,
-  RTCDeviceTypeIPhone6S,
-  RTCDeviceTypeIPhone6SPlus,
-  RTCDeviceTypeIPhone7,
-  RTCDeviceTypeIPhone7Plus,
-  RTCDeviceTypeIPhoneSE,
-  RTCDeviceTypeIPhone8,
-  RTCDeviceTypeIPhone8Plus,
-  RTCDeviceTypeIPhoneX,
-  RTCDeviceTypeIPodTouch1G,
-  RTCDeviceTypeIPodTouch2G,
-  RTCDeviceTypeIPodTouch3G,
-  RTCDeviceTypeIPodTouch4G,
-  RTCDeviceTypeIPodTouch5G,
-  RTCDeviceTypeIPodTouch6G,
-  RTCDeviceTypeIPad,
-  RTCDeviceTypeIPad2Wifi,
-  RTCDeviceTypeIPad2GSM,
-  RTCDeviceTypeIPad2CDMA,
-  RTCDeviceTypeIPad2Wifi2,
-  RTCDeviceTypeIPadMiniWifi,
-  RTCDeviceTypeIPadMiniGSM,
-  RTCDeviceTypeIPadMiniGSM_CDMA,
-  RTCDeviceTypeIPad3Wifi,
-  RTCDeviceTypeIPad3GSM_CDMA,
-  RTCDeviceTypeIPad3GSM,
-  RTCDeviceTypeIPad4Wifi,
-  RTCDeviceTypeIPad4GSM,
-  RTCDeviceTypeIPad4GSM_CDMA,
-  RTCDeviceTypeIPad5,
-  RTCDeviceTypeIPad6,
-  RTCDeviceTypeIPadAirWifi,
-  RTCDeviceTypeIPadAirCellular,
-  RTCDeviceTypeIPadAirWifiCellular,
-  RTCDeviceTypeIPadAir2,
-  RTCDeviceTypeIPadMini2GWifi,
-  RTCDeviceTypeIPadMini2GCellular,
-  RTCDeviceTypeIPadMini2GWifiCellular,
-  RTCDeviceTypeIPadMini3,
-  RTCDeviceTypeIPadMini4,
-  RTCDeviceTypeIPadPro9Inch,
-  RTCDeviceTypeIPadPro12Inch,
-  RTCDeviceTypeIPadPro12Inch2,
-  RTCDeviceTypeIPadPro10Inch,
-  RTCDeviceTypeSimulatori386,
-  RTCDeviceTypeSimulatorx86_64,
-};
-
-@interface UIDevice (RTCDevice)
-
-+ (RTCDeviceType)deviceType;
-+ (BOOL)isIOS11OrLater;
-
-@end
+#import "helpers/UIDevice+RTCDevice.h"