hopper 0.3.0

Hopper 0.3.0

Interactive use at a terminal; scripts keep every argument mandatory.

• Anything left out is asked at a terminal: instance pickers for every instance
  command, live search across Modrinth and CurseForge for install, search and
  versions, release choice only when there is one, mod pickers for disable and
  enable, a settings editor for configure, the shell for completions.
• The equivalent command is printed before anything runs whenever something was asked.
• New confirmations at a terminal: stop/restart of a running server (with players
  online), remove, applying update to a running server, onboard. Scripts and -y
  proceed as before.
• A CurseForge pack without a server pack asks whether to build from the client pack and
  keeps the answer for updates.
• New --no-input flag and HOPPER_NO_INPUT; CI also disables prompts.
  TERM=dumb or HOPPER_ACCESSIBLE=1 asks line by line. TERM=dumb disables colour.
• disable and enable accept several files.

Exit code changes:

• A missing argument exits 2 and lists every missing flag. install x --provider modrinth without --pack previously exited 1.
• A declined EULA exits 3 (previously 1). Ctrl-C at a prompt exits 130.

Verification: all 626 automated tests pass, including pseudo-terminal tests that drive
the prompts with real keystrokes and check the terminal is restored after Ctrl-C,
Ctrl-Z and SIGTERM; Clippy and formatting checks pass. The release includes a
statically linked Linux x86-64 binary and SHA256SUMS.