It's 2026 and the command handler was entirely manual!
We introduce a basic command handler framework for the REPL that handles
all the previous (implicit) features reasonably well.
This also builds up the infrastructure for nicer features.
Most important feature is that now we can let external plugins adds
commands to the REPL.
There's slight REPL changes:
- errors for debugger commands are more explicit.
- short-hand have a long-hand version.
- help shows command sorted by std::map natural key sorting (based on aliases)
while keeping the special syntaxes for the REPL language at the top.
- sections were introduced for Flakes commands.
- :st was merged into one command with an optional argument marker.
Change-Id: Ibd24f994491bf5d45d4b218fd84c0944ae5050fd
Signed-off-by: Raito Bezarius <raito@lix.systems>