Remove examples
Add link to OpenGL UI examples
Fix typo
Revert some rectangle changes that don't work on windows
Fix leak in pugl
Update pugl
pugl related changes
pugl win32 implementation
pugl osx stuff; remove extended code, not needed anymore
Implement Line::draw()
Add Rectangle::drawOutline()
Initial code for a Triangle class
Move sleep funcs into separate file, so we don't include windows.h
Try to not include windows.h for GL headers
Add Window.mm file needed for osx
Add Knob and Slider get/setId; noexcept work
Simplify Window class
Add Circle class
Fix DSSI build