Ignore Visage resources in .gitignore except for tracker.cfg
tabs to spaces
Merge pull request #3921 from Atlante45/tabs_to_spaces

Tabs to spaces
fix bug preventing butterflies from animating

(forgot to make base method virtual)
add DIRTY_UPDATEABLE flag for changes that need it
Merge pull request #3924 from ZappoMan/entityCollisions

make collision callbacks work as entity methods
Merge pull request #3925 from AndrewMeadows/thermonuclear

fix for non-animating models
move emit of collisions to after done moving entities, so that callbacks can delete entities