[TIMOB-24448] iOS: Decouple Ti.Media music-API macros

[hansemannn]

JIRA: https://jira.appcelerator.org/browse/TIMOB-24448

[vijaysingh-axway]

I think following mentioned macros are of now use. Please remove.

1. Remove macros from line of MediaModule.h-
   #if defined(USE_TI_MEDIASYSTEMMUSICPLAYER) || defined (USE_TI_MEDIAAPPMUSICPLAYER)
   #import "TiMediaMusicPlayer.h"
   #endif

2.Remove macro USE_TI_MEDIAMUSICPLAYER, line no 212, 272
3.Remove USE_TI_MEDIASYSTEMMUSICPLAYER and USE_TI_MEDIAAPPMUSICPLAYER from
#if defined(USE_TI_MEDIASYSTEMMUSICPLAYER) || defined (USE_TI_MEDIAAPPMUSICPLAYER)
RELEASE_TO_NIL(systemMusicPlayer);
RELEASE_TO_NIL(appMusicPlayer);
#endif

[hansemannn]

Updated, thx!

[vijaysingh-axway]

FT and CR passed.

[ewieberappc]

FR Passed, using:
MacOS 10.12 (16A323)
Studio 4.8.1.201612050850
Ti SDK 6.1.0
Appc NPM 4.2.8
Appc CLI 6.1.0
Alloy 1.9.5
Xcode 8.2.1 (8C1002)

Tested using the provided code in TIMOB-24448 and TIMOB-24449 as well as running the QE Media Test Suite and submitting an app to the store that uses many ti.media methods/properties. All projects compiled and no errors were encountered