ofTexture documentation

Merged documentation from ofSite, and added named groups.
Clean up text.
Punctuation and spacing.
Clean up and line length.
Clean up, spacing, grammar, line length.
Spacing.
Cleanup and being more specific.
Additional comments, corrections, etc.
Add docs in ofBaseDraw to allow doc inheritance.
Formattings.
Continued fixes.
Merge pull request #3465 from bakercp/documentation-oftexture

Documentation oftexture
Fixes #3455
ofxiOSMapKit fixes

- Casting to correct type on assignment (ofxiOSMapKitType is a enum
clone of MKMapType anyway).
- Throws an error in Xcode 6 with llvm libc++
Merge pull request #3467 from danoli3/iOS-Fixes-Map

ofxiOSMapKit fixes
Merge pull request #3466 from bakercp/documentation-oftexture

Fixes #3455