Added getter and setter for global alpha draw.

src/patch.r2

@@ -200,6 +200,8 @@ wa push 0x090d3fa0; so+1 # actionDrawSelf
 wa push 0x0912a330; so+1 # actionDrawText
 wa push 0x0910c770; so+1 # actionDrawRectangle
 wa push 0x0910bf80; so+1 # actionDrawTriangle
+wa push 0x0910ae40; so+1 # actionDrawSetAlpha
+wa push 0x0910b080; so+1 # actionDrawGetAlpha
 wa push 0x0921a520; so+1 # actionEventPerform
 wa push 0x09000f60; so+1 # actionObjectAdd
 wa push 0x09031580; so+1 # actionFontAdd
@@ -236,7 +238,7 @@ wa push 0x09abff64; so+1 # numSteps
 # Perform call.
 wa call 0x02005000; so+1 # AERHookInit
 # Cleanup call.
-wa add esp, 4 * 44; so+1
+wa add esp, 4 * 46; so+1
 # Exit thunk.
 wa jmp 0x011cb944