Fix for MAGN-174 and MAGN-176
Merge branch 'master' into MenuStylingFixInMaster
1. Fixed MAGN-190 (Crash on undoing an action that deleted two nodes with a connection)
2. Undo and redo operations are now done in the exact reversed order
3. Introduced new test case "TestDeletionsUndoRedo" to ensure simultaneous model deletion can be undone/redone correctly
Removed various dead codes that are not being referenced
Updated fix for MAGN-174 and MAGN-176
Merge branch 'master' into DeadCodeRemoval
Merge branch 'master' into MAGN190
Merge pull request #501 from Benglin/MAGN190

Fix for critical defect MAGN-190
Merge pull request #502 from Benglin/DeadCodeRemoval

Removed various dead codes that are not being referenced
Merge pull request #503 from SkyApple/MenuStylingFixInMaster

Fix for MAGN-174 and MAGN-176