Get rid of memcopies in codegen, improve Multimedia

modules/Multimedia.core

@@ -8,11 +8,13 @@ API and name inspired by one of Per Vognsen streams
 https://www.youtube.com/watch?v=NG_mUhc8LRw&list=PLU94OURih-CjrtFuazwZ5GYzTrupOMDL7&index=19
 All of his channel is recommended watch for programmers.
 */
-Mu :: struct
+Mu: MU
+MU :: struct
   scrn: *U32
   x   : S64
   y   : S64
 
+  key: [Key.Count]KeyState
   frame_count: U64
   time: MuTime
   quit: Bool
@@ -26,7 +28,18 @@ MuTime :: struct
   start      : F64
   frame_start: F64
 
+KeyState :: struct
+  is_down: Bool
 
+Key :: enum
+  Nil
+  Up;Down;Left;Right;Escape;Control;Backspace;Alt;Shift;Tab
+  F1;F2;F3;F4;F5;F6;F7;F8;F9;F10
+  F11;F12;A;B;C;D;E;F;G;H
+  I;J;K;L;M;N;O;P;Q;R
+  S;T;U;V;W;X;Y;Z;K0;K1
+  K2;K3;K4;K5;K6;K7;K8;K9
+  Count
 
 StartMultimedia  :: W32.StartMultimedia
 UpdateMultimedia :: W32.UpdateMultimedia