Client builds & runs, can't test the gameplay without the server

SDL_ttf is now being initialized, and all usages of fonts are now checked for nullptr.
A bug where the renderer's logical size was not properly set has been fixed.
The FPS counter is disabled for now.

client/gameplay_scenes/makefile

@@ -6,9 +6,6 @@ CXXFLAGS+=-std=c++11 $(addprefix -I,$(INCLUDES))
 #source
 CXXSRC=$(wildcard *.cpp)
 
-#DEBUG: Overwrite the wildcard
-CXXSRC=world_logic.cpp
-
 #objects
 OBJDIR=obj
 OBJ+=$(addprefix $(OBJDIR)/,$(CXXSRC:.cpp=.o))
@@ -19,7 +16,7 @@ OUT=$(addprefix $(OUTDIR)/,client.a)
 
 #targets
 all: $(OBJ) $(OUT)
-#	ar -crs $(OUT) $(OBJ)
+	ar -crs $(OUT) $(OBJ)
 
 $(OBJ): | $(OBJDIR)