Restructured the common/ directory, and simplified the build process

common/graphics/makefile

@@ -2,16 +2,13 @@
 INCLUDES+=. .. ../map
 LIBS+=
 CXXFLAGS+=-std=c++11 -DDEBUG $(addprefix -I,$(INCLUDES))
-CFLAGS+=-DDEBUG $(addprefix -I,$(INCLUDES))
 
 #source
 CXXSRC=$(wildcard *.cpp)
-CSRC=$(wildcard *.c)
 
 #objects
 OBJDIR=obj
 OBJ+=$(addprefix $(OBJDIR)/,$(CXXSRC:.cpp=.o))
-OBJ+=$(addprefix $(OBJDIR)/,$(CSRC:.c=.o))
 
 #output
 OUTDIR=../..
@@ -34,9 +31,6 @@ $(OUTDIR):
 $(OBJDIR)/%.o: %.cpp
 	$(CXX) $(CXXFLAGS) -c -o $@ $<
 
-$(OBJDIR)/%.o: %.c
-	$(CC) $(CFLAGS) -c -o $@ $<
-
 clean:
 	$(RM) *.o *.a *.exe