Implement drag/drop object placement and more fixes.

[EM20080]

No description provided.

[EM20080]

Additional changes include: the "Place object" button has been removed and replaced with drag-and-drop placement. DevTools now automatically selects the first chunk and the main layer on load. Object searching is now case insensitive. CTRL+Drag cloning has been implemented. Player teleportation has been fixed to display in debug pause /object pause, and Shadow's quills no longer extend incorrectly on teleport due to GOCPhysicalAnimationBullet.

[Ashrindy]

Looks great, one nitpick I have though is that, would it be possible to keep the Place Object button as a fail-safe? Maybe just my personal view on this.
Also something else that doesn't have to be solved this PR, would be a centralized search function, since now only the Level editor will have a case-insensitive search.
Other than that, LGTM.