Req: `-c` and `--config` to provide path to config.json

[bobpaul]

I like to make a package for this for archlinux and I have 2 goals:

• the installed path should be immutable with a config file in /etc
• a systemd template making it easier to run multiple bridges on the same server (each instance will have its own config, registration, and hangups token). Eg, an instance would launch via [email protected] and point to configs/tokens specific for the FOO user.

To achieve these goals without a lot of weirdness in my package, I need the config path to come from the command line (it can default to ./config.json if the option isn't provided). matrix-appservice-irc has a config provided by the commandline, but I'm not a strong javascript developer and it's not clear to me how this is enabled.

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Ideally, I'd also have a -t, --token argument to provide the path to the refresh token rather than using ~/.cache/hangups/refresh_token.txt. But I can set HOME in the systemd service to move that.

[bobpaul]

Looks like I'll need to move the room-store.db and user-store.db, too.