Fixed backend API, again.

Turns out track.getInfo just doesn't feel like serving image data anymore, even though the example response shows it. I love last.fm so much.

Various fixes

Document lua, fix small theme bugs

Lua dev mode functional

Lua support feature-complete

Full implementation of debug mode still pending

lua loading

html.lua functional

Start of Lua support

clippy

Remove ResponseCtx

whitelist -> allowlist

Use http::Response for constructing replies

Add SPDX info to all files

Theming refactor

Theming has been broken off into a seperate space, so that it'll be easier to add lua support later.

Unify import style

Move caching to src/cache/; Finalize API parsing fixes

Font and user cache code has been moved to special files, independant from src/config.rs

API parsing changes have been properly tested, and last.fm API JSON is now trace-logged for debugging convenience.

Reliable user info; Font refactor

Hit a few more endpoints to fix missing images, fallback to default album art just in case.

Refactor the font cache into its own file.

Clippy

Cleanup

Custom font support complete