Refactored Vertex and GameVertex classes into their own files, put some functions in GameVertex that made sense there

Makefile

@@ -7,7 +7,7 @@ LDFLAGS=`sdl-config --libs` -lSDL_ttf
 OBJECTS=\
 main.o \
 drawutils.o mathutils.o timer.o itos.o \
-graph.o gamedata.o player.o \
+graph.o gamedata.o player.o vertex.o gamevertex.o \
 menubutton.o \
 mainevent.o gamestate.o game.o titlescreen.o