Removed redundand code, added string const for drag&drop mime type
rename of scenedisplay_.* to scenedisplay.*
rename of bodydisplay_.* to bodydisplay.*
rename of actiondisplay_.* to actiondisplay.*
new menuaction and shortcut for start/stopping a simulation

removed old start and stop actions
typo "toggle"
Merge remote-tracking branch 'origin/master'