Begin raymarcher example and math module, fixing parsing bugs

modules/os_windows.kl

@@ -34,6 +34,7 @@ Commit :: (m: *Memory, size: SizeU): Bool
       flAllocationType = MEM_COMMIT,
       flProtect        = PAGE_READWRITE,
     )
+    Assert(result != 0)
     m.commit += adjusted_commit
     return true
   return false