Operations widget height fix and abort button feature.  Successfully
tested resizing of Operations QDockWidget for multiple concurrent
operations.
Merge remote-tracking branch 'graffy76/master'
removed a redundant function call
fixed another case handling problem
added add-on global variables in the same way add-on GMSTs were added
update NpcAnimation inventory reference on cell change
fix invalid SceneNode pointer on cell change
remove insertMesh() call on object cell change
TradeWindow: fixed coding style

Mentioned here: https://github.com/zinnschlag/openmw/pull/554
Merge remote-tracking branch 'greye/cross-cell'
Fix for operations widget - hides when no operations are running.
Merge remote-tracking branch 'graffy76/recentfiles'
updated credits files
fixed various warnings about converting size_t to int
apply MSVC warning settings to shiny projects
Merge remote-tracking branch 'blunted2night/size_t-warnings_v2'