RD-4: Implemented V_Init(). Also moved some constants to be more in-line with the original source code

src/main.rs

@@ -1,9 +1,11 @@
 mod d_main;
 mod d_strings;
 mod doomdef;
+mod doomtype;
 mod hu_stuff;
 mod m_argv;
 mod m_misc;
+mod v_video;
 mod w_wad;
 mod math;