Add lock and group icon to scene tree editor
Fix crash in editor when open new scene in editing

resources_dock->cleanup(); // This will delete GDScript instance (if property_editor->obj is scene's GDScript instance, editor will crash)
Merge pull request #381 from marynate/PR-scene-tree-icons

Add lock and group icon to scene tree editor
Merge pull request #383 from sanikoyes/hotfix-Crash-In-Editor

Fix crash in editor when open new scene in editing
Make visibility icon always last to display in scene tree
Make visibility icon always last to display in scene tree
Merge remote-tracking branch 'upstream/master' into dev
Merge branch 'PR-scene-tree-align-eye-icon' into dev

Conflicts:
	tools/editor/scene_tree_editor.cpp