[TIMOB-14396] Tab icon/activeIcon Fixes

[vishalduggal]

PR for TIMOB-14936

Test is in JIRA

1. New property on tabGroup - tabsTintColor
2. icon and activeIcon can now be specified to be rendered in original or template mode on IOS7+. Properties iconIsTemplate, activeIconIsTemplate. Default - true

Known Issue:

1. On IOS7+ activeTabIconTint property of tabGroup is not being honored. No idea why. tabsTintColor seems to work better (though it tints the title as well and works on active tab only though the docs say it should apply to all tabs.)

Docs will be updated along with the windowRefactor doc PR.

[srahim]

This is a very minor quibble. The API name iconisTemplate/ activeiconIsTemplate sounds confusing. I know its what Apple calls it too. People might get confused as to what template means. Does iconMask, activeiconMask sound any better ?

Apart from that minor problem. Everything looks good. Code looks good.

[srahim]

Functionally Tested and APPROVED

[srahim]

Waiting for feedback from Vishal to process this PR.

[srahim]

Code Looks good. APPROVED