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
Merge pull request #386 from marynate/PR-scene-tree-align-eye-icon

Make visibility icon always last to display in scene tree
Shift+Del to delete nodes without confirmation
Change key move behavior of canvas item editor to ignore zoom level; Add
alt + arrow key as local base move mode; Control + arrow key as local +
rotation move mode
Fix LineEdit selected text drag and drop behavior: move instead of duplicate selected text; maintain selection after drag and drop.
Merge pull request #397 from marynate/PR-line-edit-drag-n-drop

Fix LineEdit selected text drag and drop behavior
Merge pull request #393 from marynate/PR-2d-key-move

Tune 2d editor arrow key move mode
Merge pull request #392 from marynate/PR-delete-without-confirm

Shift+Del to delete nodes without confirmation
Make String::right count from pos instead of pos+1
Merge pull request #408 from marynate/PR-string-right

Make String::right count from pos instead of pos+1
User can use '.METHOD' or 'METHOD(' to seach exact method in Search Classes dialog
Merge pull request #409 from marynate/PR-help-seach-exact-method

Use simple pattern '.METHOD' or 'METHOD(' to search method in Search Class Dialog
A bit of everything:

-IMA-ADPCM support for samples, this means that sound effects can be compressed and use 4 timess less RAM.
-New 3D import workflow based on Wavefront OBJ. Import single objects as mesh resources instead of full scenes. Many people prefers to work this way. Just like the rest of the imported resources, these are updated in realtime if modified externally.
-Mesh resources now support naming surfaces. This helps reimporting to identify which user-created materials must be kept.
-Several fixes and improvements to SurfaceTool.
-Anti Aliasing added to WorldEnvironment effects (using FXAA)
-2D Physics bodies (RigidBody, KinematicBody, etc), Raycasts, Tilemap, etc support collision layers. This makes easy to group which objects collide against which.
-2D Trigger shapes can now also trigger collision reporting in other 2D bodies (it used to be in Area2D before)
-Viewport render target textures can now be filtered.
-Few fixes in GDscript make it easier to work with static functions and class members.
-Several and many bugfixes.
Merge remote-tracking branch 'upstream/master'