asset updates

Signed-off-by: Miles Whiticker <miles.whiticker@gmail.com>
3/4 work
- added a rpoper gui
- cleaned+improved up level/menu handling
- various gameplay changes

Signed-off-by: Miles Whiticker <miles.whiticker@gmail.com>
Merge branch 'master' of https://github.com/mileswhiticker/ld26_spread