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/legofullscreenmovie.h

@@ -0,0 +1,15 @@
+#ifndef LEGOFULLSCREENMOVIE_H
+#define LEGOFULLSCREENMOVIE_H
+
+#include "mxvariable.h"
+
+// VTABLE 0x100d74b8
+// SIZE 0x24
+class LegoFullScreenMovie : public MxVariable
+{
+public:
+  LegoFullScreenMovie(const char *p_key, const char *p_value);
+  virtual void SetValue(const char *p_option) override;
+};
+
+#endif // LEGOFULLSCREENMOVIE_H