Retrofitted to pure Rust

[7sDream]

A few days ago, I opted to use fontconfig and freetype for this task, as I was operating in a macOS/Linux environment. However, the native Linux technology had issues, such as static linking not functioning in macOS (See #10), which led me to consider a macOS native technology (CoreText, See #18). This approach, however, required a deep understanding of the system API, and to be frank, I’m not a fan of Objective C.

Currently, I primarily use a Windows PC during my non-working hours, and this small tool remains crucial for my typography and writing projects. Therefore, I’ve decided to transition to a pure Rust implementation, with the assistance of the excellent crates, fontdb and ab-glyph.

I’ve already made some progress, such as updating and fixing clippy/rustfmt, upgrading the Rust edition, cleaning up dependencies, and so on. I’ve also commenced the rewriting process:

• [x] workspace
  • [x] edition 2018 -> 2021
  • [x] rustfmt configure, error fix
  • [x] clippy configure, error fix
• [x] dependencies
  • [x] remove: fontconfig, freetype
  • [x] update: many
  • [x] change: tui -> ratatui
• [x] use fontdb to load system fonts
• [x] filter font faces contains the asked character
• [x] group by family and sort by name rewrite
• [x] make the list display mode works 🥳
• [x] make the browser preview works 🥳
• [x] use ab-glyph(or other) to resterize font
  • [x] figure out how to set size
  • [x] 256 alpha mode
  • [x] mono mode
• [x] make the tui preview works 🥳
• [x] update README, Changelog

Current state: all feature works.