Panel improvements

panel navigation should be completely bulletproof now.
new focus checker checks if what you clicked was valid after focus was
lost, if not then re-selects the yellow panel.
Merge remote-tracking branch 'origin/master'

Conflicts:
	Binary Defender/Binary Defender.userprefs
	Binary Defender/Library/InspectorExpandedItems.asset
	Binary Defender/Library/ScriptAssemblies/Assembly-CSharp-Editor.dll
	Binary Defender/Library/ScriptAssemblies/Assembly-CSharp-Editor.dll.mdb
	Binary Defender/Library/ScriptAssemblies/Assembly-CSharp.dll
	Binary Defender/Library/ScriptAssemblies/Assembly-CSharp.dll.mdb
	Binary Defender/Library/assetDatabase3
	Binary Defender/Library/guidmapper
	Binary Defender/Library/metadata/e4/e46a76efefcf7b54b9e1524dc0cc7873

throwing away my side of conflicts.