[DISCUSS] Plugin script style

[zyxkad]

For now plugin is a packed javascript codes, it's metadata is defined in package.json.

See more information at https://github.com/kmcsr/go-liter/tree/master/script#readme

An example for plugin is at https://github.com/LiterMC/plugin-afk

[zyxkad]

Now plugin must be packed as a zip use the script provided by create-glp.
And people can easily setup their environment by do npm init glp@latest <plugin-name>.

Just for easier developing, I may allow go-liter to load script as a folder and allow to configure reload when file changed, so people don't have to edit code -> pack -> copy file -> reload -> test behaviour they only have to do edit code -> test behaviour