animator debugged
removed colorman. a theme manager should be in "ui"
removed #include "colorman.hh" in backend.hh
included what should be included in core.hh
removed debugging code
removed wrongly-used "const"
added default argument for gl::clear
fixed makefile; cleared up ui
updated geometry.hh
added snap
added simple arithmetic for Point
+ grid_snap
added defaults for gl::text