Support extra information, such as git describe, in version string
Adjust physics layout to match D1X
Simplify logic for robot to drop proximity and smart bombs
Simplify processing of $ insertion of name in multiplayer messages
Use ubyte/const ubyte consistently in multiplayer messaging
Add helper to get pointer to reactor definition
Fix debug=1 build break from 2a3524cd ("Move segment handling from editor.h")

When debug is enabled, gamecntl references symbols that moved to the new
header.
Remove unused include/ps*.inc
Add proximity bomb ID test helper