better way to prevent PROT in fusion
Redo sandcolor to use alpha, so that when powders transition they don't stay the same color

Also make color change less sharply over time
fix bug where STKM can be killed from HSWC when turned off
fix flood fill. This was a mistype, and the original check I had doesn't work all the time anyway (so just remove it)
insulators block ambient heat (when there are a lot nearby)
fix element buttons not changing color when using tpt.el.color, remove 4 char restriction on element names with tpt.el.name
manually fix bug where sometimes the top / bottom pixel of circle brushes would disappear
fix holes in wall lines with a small radius (again)
Merge pull request #3 from simtr/develop

Merge TPT