[Max2D] Add "render image" support (render2texture)

[GWRon]

requires the pub.mod-PR fixing some DirectX function definitions

[GWRon]

Updated branch to contain all the current brl.mod changes

[GWRon]

Updated branch (rebased).

Sample code still compiles and runs fine:

SuperStrict
Framework Brl.StandardIO
Import Brl.RandomDefault
Import Brl.GLMax2D
'Import Brl.D3D9Max2D
'Import SDL.D3D9SDLMax2D
'Import Sdl.GLSDLMax2D
'Import SDL.GL2SDLMax2D

Graphics(800, 600)
SetBlend AlphaBlend

Local rt:TRenderImage = CreateRenderImage(300, 150, False)

'render into the texture
SetRenderImage(rt)
For Local i :Int = 0 To 100
    SetColor Rand(0,255), Rand(0,255), Rand(0,255)
    DrawText("Hey", Rand(0, rt.width-50), Rand(0, rt.height-20))
Next
SetRenderImage(Null)

SetColor 255,255,255
SetClsColor 40, 80, 160
While Not KeyDown(KEY_ESCAPE)    
    Cls
    
    SetScale 2,2
    DrawImage(rt, MouseX(), MouseY())
    
    Flip
Wend

End

[braxtonrivers]

Thank you very much for this, working great here on win 10 x64

[GWRon]

Cleaned the PR with a soft-reset and rebase to upstream head (so includes the latest "long" changes)