Text formatting support for scripts

[Column01]

Right now, scripts can be run using mark2 events. I'd like to support formatting properties from certain events into the commands that get executed.

For example:

1. React to the player chat message
2. Have it execute msg {username} I saw you sent a chat message!
3. mark2 formats the {username} to be whatever the PlayerChat event had for the username.

As far as I know, it should just be adding something to the args for the execute function that passes the event to it? Then we can just format the cmd with python to fill in placeholders. https://github.com/gsand/mark2/blob/8419151405cb16427371f256f3662a9370a55e0e/mk2/plugins/script.py#L29

Would probably become self.plugin.register(lambda e: self.execute(command, e), event) because AFAIK, e in this instance is the event. Then we'd just need code to format the event properties into the command string

[Column01]

Wow, that was incredibly easy to implement. Events already had a way to serialize it so it was just a matter of ensuring all values are strings and then using a custom safe dict to ensure missing keys are just returned as {key} instead of raising a ValueError

Added in https://github.com/gsand/mark2/commit/2a5a7ee4da775b474e7e8c80314a4b7da47b1a58