utility functions in rects/vec2d
- snap_point
- clamp
introduced camera smoothing and crosshair behaviour
simple crosshair blinking
corrected warnings with incompatible float/int types
changed value animator callback policy
deleted performance check
raw_input event - took advantage of HD mouse input
improved relative chase
top speed behaviour draft
lookat does not emit moved message unnecessarily
new demo - moving around screen with collisions
and smooth camera chasing