[TIMOB-16697] (3_4_X) Titanium Project cleanup

Cherry Pick PR #6269 , PR #6207 and PR #6218 into 3_4_X

This PR bumps the deployment target on Titanium projects from 5.0 to 7.0
It enforces our min-ios-ver support of 7.0 (3.4.0 and 3.4.1 can still be built with min-ios-ver 6.0)
It also enforces minSDK of 8.0. Right now you can build apps with minSDK of 7.0

Major code changes include the following
1. AudioRecorderProxy moved from AQRecorder to AVFoundation/AVAudioRecorder
2. Deprecation of  status bar styles, color constants
3. AdView refactor 

As part of this we have also enabled most of the compiler flags suggested by XCODE
The following warnings are still generated
1. Missing Launch Image - Ignore this for now. We take care of proper launch images in our build script
2. Validate Project Settings (Details below)

2a. Enable undeclared selector warning - We will probably not enable this flag anytime soon due to the amount of code refactor required
2b. Enable Unreachable Code warning - We will defer enabling this flag till we factor out the SCListener and MGSplitViewController libraries
2c. Enable Implicit conversion to 32 bit - This will generate warning in the a few third party library. We can choose to keep this disabled but should update titanium code to not generate this warning if enabled.
2d. Automatically select architectures - This will done as part of 64bit support

Regression path - KitchenSink