examples: fixes for rpi + remove remaining calls to glBegin/glEnd
linux glfw: some fixes for dnd
ofAppGLFWWindow: linux, fix glfw include
create_package: don't delete linux scripts for armv6 & 7
ofGLProgrammableRenderer: fix tabs for bitmap font
ofVbo: hack to fix vbo usage in rpi
glfw linux: fix getPosition correction
armv6 install_dependencies: include assimp
ofxAssimpModelLoader: fix armv6
fixes for armv7
Merge branch 'develop' of https://github.com/openframeworks/openFrameworks.git into develop