fix floating point bs (#347)

Author: rdragan

code/__DEFINES/maths.dm

@@ -109,7 +109,7 @@
 #define TORADIANS(degrees) ((degrees) * 0.0174532925)
 
 /// Gets shift x that would be required the bitflag (1<<x)
-#define TOBITSHIFT(bit) ( log(2, bit) )
+#define TOBITSHIFT(bit) ( round(log(2, bit), 1) )
 
 // Will filter out extra rotations and negative rotations
 // E.g: 540 becomes 180. -180 becomes 180.