Ensure that all member attributes are initialized

I ran the game through cppcheck and it spat out a bunch of member
attributes that weren't being initialized. So I initialized them.

In the previous version of this commit, I added constructors to
GraphicsResources, otherlevelclass, labclass, warpclass, and finalclass,
but flibit says this changes the code flow enough that it's risky to
merge before 2.4, so I got rid of those constructors, too.

desktop_version/src/BlockV.cpp

@@ -19,6 +19,9 @@ blockclass::blockclass()
 	r = 0;
 	g = 0;
 	b = 0;
+
+	x = 0.0f;
+	y = 0.0f;
 }
 
 void blockclass::rectset(const int xi, const int yi, const int wi, const int hi)