set tab indentation in xcode OF projects
fixed bug where getIndexAtLength(perimeter) returns 0 instead of the final index. closes #3389
ofxNetwork: utils: remove unused WOUDBLOCK error

This error is not managed. Moreover it corresponds to EAGAIN on OSX which is
already present into the switch and leads to a build error.
ofxNetwork: UDP: remove unused err variable
Merge pull request #3395 from admsyn/feature-xcode-lib-tabs

Specify tab indentation in xcode projects (just the OF libs)
Merge pull request #3393 from vdonnefort/ofxNetwork

ofxNetwork: build and warning fixes
ofTexture: fix readToPixels for non aligned to 4 formats