Shake function
basic_math: Add int_div_up, a fast integer divide that rounds up instead of down.
debug_break: Fix macro ifdef
math2d: mark some comparator functions as const
math2d: get rid of the single argument vecLength, since it allows implicit conversions from floats into vecLengths. add a new forRadius static method to create vecLengths for testing if a point is inside a circle.
add forward declare version of math2d
add atl util functions for narrowing 64-bit int types to 32-bit int. no special functionality, but allows these casts to be more easily identified, and potentially expanded upon.