Replace settings to default plugin setting ui

[Freaku17]

Closes #60

[rikkolovescats]

we'll also have to update existing plugins making use of on_plugin_manager_prompt to these new methods

[rikkolovescats]

also last time i checked show_settings_ui takes a(/an optional?) param, haven't tried it myself but curious how it works and if we'll be missing any of its functionality here in plugin man

[Loup-Garou911XD]

show_settings_ui when being called by ba.Plugin gets a button widget as an argument

[Freaku17]

also last time i checked show_settings_ui takes a(/an optional?) param, haven't tried it myself but curious how it works and if we'll be missing any of its functionality here in plugin man

I'm so sorry I didn't see that, added those back

[rikkolovescats]

let's mark this as a minor release (0.2.0), and we'll have to update docs for on_plugin_manager_prompt in README

[Freaku17]

This looks a little messy now, and other PRs are also conflicting.

I'll make a fresh new PR 👍