modify ofxContent & ofxDropDownList & ofxQuadWarp
Increase support for fontStash features
update .gitmodules
Merge branch 'sonovo-ofxGui' of github.com:yty/openFrameworks into sonovo-ofxGui

Conflicts:
	libs/openFrameworks/utils/ofXml.cpp
	libs/openFrameworks/utils/ofXml.h
Modify ofxBaseGui & ofxDropDownList
Merge branch 'sonovo-ofxGui' of github.com:yty/openFrameworks into sonovo-ofxGui
Merge branch 'sonovo-ofxGui' into sonovo-master

Conflicts:
	.gitmodules