v1.5.0

• @Shawnecy Chased down a divide by zero in the lighting shader

• Added Layered brushes
  This is a pretty large feature that's not super well documented. Stay tuned
  for tutorials on YouTube.

• Added TextBox in ui
  Takes a pointer to the char buffer to write the new text into.

• Added two new resize modes to the selection

• Added White noise

• Change noise generation to internally operate on blocks of memory that are multiples of the SIMD register size.
  User code should not be affected by this change, other than to now be able
  to reliably assume the chunks passed to the world gen functions are
  right-sized to just blast through the whole thing in the SIMD path. The
  unused portion is discarded.

• Added SkyColor to graphics struct

• Fix spamming SoftError from worker threads if a world chunk buffer was not large enough to fit all geometry.
  The new behavior is to print the error once, then go silent.

• A few minor bugfixes and usability improvements