MxVariable subclass for fsmovie setting (#147)

* LegoFullScreenMovie variable and related

* Changes after review
- Reduce scope on global strings
- Size assert for LegoGameState (based on the constructor references only)
- 1 -> TRUE for EnableFullScreenMovie

LEGO1/legobackgroundcolor.h

@@ -3,11 +3,13 @@
 
 #include "mxvariable.h"
 
+// VTABLE 0x100d74a8
+// SIZE 0x30
 class LegoBackgroundColor : public MxVariable
 {
 public:
   __declspec(dllexport) LegoBackgroundColor(const char *p_key, const char *p_value);
-  void SetValue(const char *p_colorString);
+  virtual void SetValue(const char *p_colorString) override;
 
 private:
   float h;