* updated imgui/cimgui to latest revision (docking branch)

merge

* more work on module system

* more work on module

* fixed broken tar command

* updated win32 dependency for SDL2

* added missing preamble to imgui_impl_sdl.h

* fixed blocktree for changes in scopes

* initial work on interval/RAA arithmetic module
* sdf: made `sdBox` work for all fvec types

* testing for new gpu instructions

* fixed launch-tukan

spritepainter uses registered size

* initial check-in sprite painter

* removed unused modules from test

* removed comments

* ported `test.c` from bullet to scopes

* added C bindings for Bullet

* ODE: joint upcasting and dispatch

* ODE: more properties

* ODE: more work on interface, geom offsets