Add DevControlBot garage: skeleton bot with release/debug build script

A minimal Tank Royale bot that boots and stands still. Body, gun and radar
are set to white once at init (team convention: white = not programmed yet);
the tick loop only calls go().

- DevControlBot/ holds the single bot module, its metadata JSON, the
  BotLauncher entry script and the nimble file
- DevControlBot.sh is a thin wrapper around the runBot nimble task:
  release build by default, --debug for the classic diagnostic build
- dependencies resolve at run time from the global nimble store via
  `nimble path`; optional .env (gitignored) supplies env vars such as
  SERVER_URL, with existing environment variables taking precedence
- build happens in a throwaway mktemp dir removed on exit; no artifacts

DevControlBot_garage/PLAN.md

@@ -0,0 +1,6 @@
+1. Create a tidy Bot garage folder
+2. Make inside a folder ready to be exported and shared with others
+3. Create a basic bot with all white colors and does nothing else
+4. make a nice runnable in bash script fro the RT official launcher
+5. add nice radars: 1vs1 and melee
+5. decide the gun to develop