Process Loader queue before frame events in player's main event loop

Testing shows that that's how it is in the player.
Add reftest for Loader.load
Merge pull request #1618 from tschneidereit/master

Execute queued Loader operations before frame events in main event loop
Merge pull request #1619 from yurydelendik/reftest

Waits committing frames until initial data is loaded
Overlay SWF on top of inspector.
Merge pull request #1620 from mbebenita/overlay

Overlay Flash on top of inspector.
Add inspector option for Flash overlay

Enables toggling the overlay at runtime, too.
Merge pull request #1621 from tschneidereit/master

Add inspector option for Flash overlay
Merge pull request #1622 from yurydelendik/master

Fixes rAF dependency during reftest
Merge pull request #1623 from yurydelendik/master

Moves failing stas tests into separate file