Swapped Triangle for more general Polygon
Fixed direction NONE not being saved correctly
Added DB reloading, moved hotkeys init...

...to Manager,
allowed editor to start in test mode when game archives are not located,
fixed DatabaseCore item being draggable and thus removeable in
ModManagement,
added Location and Modifier listeners
Update readme_developers.txt
Merge branch 'master' of https://github.com/kartoFlane/superluminal2