*if blocks, vector improvements, and round*
-Removed scratch variables, now indexing vectors directly
-Added round (1-arg version)
-Added branching (if-elif-else)
 - Changed KernelArgs length field to unsigned int (was signed int)
 - Made significant architectural changes to accommodate other data types besides 32-bit float
 - Added extremely basic support for unsigned 32-bit integers
 - Switched to intrinsic sqrt function (_mm_sqrt_ps)
 - Finished implementation of USub (unary negation) operator
 - Implemented several math and intrinsic functions
 - Implemented mod operator for floating-point and integral types:
Merge branch 'master' of https://github.com/undefx/vecpy