Add other targets to api documentation

[Vortex2Oblivion]

The api documentation only shows classes available on the flash target currently. Classes that aren't available on that target are not available because of this (say FlxRuntimeShader for example). It also does not specify when something is only available on flash (say rotationZ in DisplayObject for example). Most people don't build to flash ao including other targets would be very helpful (c++, hl, js, etc).

[Vortex2Oblivion]

I think #160 might be related? not sure tho.

[Vortex2Oblivion]

#264 is definitely related

[Vortex2Oblivion]

#132 too
Seems like it's been flash only for atleast 10 years now

[Vortex2Oblivion]

@Geokureli its been a while but I'd still like this to happen

[Geokureli]

The easiest solution is to use a target that has the most features and compiles fast enough. It might be as easy as changing this and this

Ideally we would build them all and list which targets they are available on (I think hl and cpp are interchangeable, enough)