A much faster filterList() proc

What it says on the tin, from my tests of brute forcing 10000 numbers (1-10000) the original filterList() takes 4.8 ticks, with mine taking 0.400009 ticks, a MASSIVE improvement.

These numbers will be slightly different considering the use of istype() in the proper build, but mine should still win out by a longshot.

Correctly excludes the excluded, correctly filters the filter.