ios-bugfix-rename-step-1

this is the first PR (1/3) for renaming ofxiPhone to ofxiOS - issue #1382

this first step is concerned with updating the ios xcode projects to use ofxiOS naming.
full list of changes are below,

- ofxiPhone folder has been renamed to ofxiOS
- adjusted CoreOF.xcconfig - now uses HEADER_OFXIOS with new path to ofxiOS folder.
- renamed product of the static lib to begin with ofxiOS
- renamed ofxiphone-Info.plist to ofxiOS-Info.plist
- renamed iPhone_Prefix.pch to iOS_Prefix.pch
- adjusted projectGenerator and ios xcode template project to account for the above changes.
- gitignore files have been adjusted to ignore the new names.

have tested rebuilding all the ios examples using the projectGenerator and all working well.
but if someone else can give this a test, that would be great!