Fix some formatting issues with INSTALL.md
Make menu_brown_1 selectable as menu level (#122)
Fix world saver treating lines as sprites (#116).

Actually, there ARE a cSprite subclass, but with no image attached.
They should probably be no sprites at all.
Fix world waypoints being loaded at (0|0) always (#116).
Properly implement Function_Reload(). Fixes #125.

Instead of cheating the level manager, the method now executes
a proper game mode change that instructs to first delete the
level and then load the level anew. No worries with incomplete
sprite loading that way.
Allow negative TTL and rotation values for particle emitters (#91).
Merge branch 'release-2.0.0' into devel
Merge branch 'devel' of github.com:Secretchronicles/SMC into devel