fixed missing LocationInit

closes #5076
GravityBomb palette can now be customized the same way as for Bullets and Missiles.

Update CHANGELOG.

Also mentioned Bullets and Missiles since it seems there wasn't an entry for that before.
Add singleplayer mission menu to ra/td
disallow adding actors from other players to control groups

closes #4949
Merge pull request #5141 from Mailaender/production-locationinit

Fixed 0,0 shroud reveal when producing units on maps with tiny cordons
Merge pull request #5140 from Mailaender/enemy-controlgroups

Added checks to prevent adding enemy units to control groups
take low power slowdown into account

fixes #4840
Merge pull request #5144 from Mailaender/cnc-lowpower-buildtime-tooltip

Fixed C&C build palette tooltip not taking low power slowdown into account
Merge pull request #5137 from reaperrr/gravitybomb-palette

Made GravityBomb palette customizable
Merge pull request #5133 from ScottNZ/new-menu

Add singleplayer mission menu to ra/td
converted INSTALL to Markdown

moved licensing information to the README
Merge pull request #5148 from Mailaender/install-markdown

Converted INSTALL to Markdown
Update README.md

PNG → SVG
StyleCop
only show welding overlays when factories are producing

closes #3756