Basic plugins support

[RobertCraigie]

I'm considering supporting plugins through a list of directories where glide will automatically source files from, e.g. ~/.config/glide/plugins/

for example, we would then check all subdirectories for glide.ts and browser.css (for theming the browser UI itself), e.g.

~/.config/glide/plugins/github/glide.ts
~/.config/glide/plugins/github/browser.css

this would enable sharing plugins pretty easily as the installation instructions for a plugin would just be git clone https://github.com/RobertCraigie/github.glide ~/.config/plugins/github.

some open questions:

• what should the default paths glide searches for plugins be?
• when are the plugins searched?
• how do you customise the plugin paths?

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One cool thing would also be supporting a types.d.ts, or similar, in the plugins that would get automatically sourced somehow, so that plugin types are reflected easily.