Remove unused x and y attributes of blockclass

These float attributes are assigned to, and then never read again. The
coordinate systems of blocks are a bit of a mess - some use xp/yp, some
use xp/yp and rect.x/rect.y - but I can confidently say that these are
never used, because it compiles fine if I remove the attributes from the
class, plus remove all assignments to it.

desktop_version/src/BlockV.cpp

@@ -23,9 +23,6 @@ void blockclass::clear(void)
 	g = 0;
 	b = 0;
 
-	x = 0.0f;
-	y = 0.0f;
-
 	/* std::strings get initialized automatically, but this is */
 	/* in case this function gets called again after construction */
 	script.clear();