Flash ActionScript 3 Support

[RobertBeckebans]

This allows to import new Flash (.swf) menus created by Adobe Animate.

The implementation will be basic so it is enough to import new files without the need of some cracked warez edition of the abandoned Macromedia Flash.

Kudos to @HarrievG for all the hard work.

[stephenap07]

@HarrievG I've been testing this with an incomplete SWF file, but one I thought would be good enough to test functionality.
When loading my test SWF back in binarized format, I get an assertion. I'll attach my FLA to the discord if you want to look at it.

Other issue: the stop(); function in a frame is never executed for some reason. I haven't looked too far into why yet, I'll probably try to debug this tomorrow.

Since the stop function is never run, my carousel widget plays the rollIn/rollOut animations continuously.

myswf.webm

[HarrievG]

If you send your fla I can do something. Images and screenshots are useless here.
It also is better to continue this bughunt on discord in the standalone dev channel where I shared my test fla with you.

[HarrievG]

Just to follow up on this for future reference:
the swf publish and AS settings need to be to

1. debugging permitted
2. disabled strict mode
3. disabled warning mode
4. Set the action script api to be used as source path. -> inhibitControl () is an engine function and needed for basic ingame UI functionality

[HarrievG]

@stephenap07 Can be closed?

[RobertBeckebans]

I rebased the branch on the master/1.5.1 and added @HarrievG's last crash fix.

[HarrievG]