Backwards compatibility

• [] Processor -> rewrite https://github.dev/windicss/windicss/tree/main/src into index.ts
  • [] interpret
  • [] preflight
  • [] attributify
  • [] e
  • [] config
• [] Stylesheet & Style -> rewrite https://github.dev/windicss/windicss/tree/main/src & https://github.dev/windicss/windicss/tree/main/src into styles.ts
  • [] build
  • [] children
  • [] prefixer
  • [] sort
• [] CSSParser -> rewrite https://github.dev/windicss/windicss/tree/main/src into parsers/css.ts to have smaller footprint but also keep backward compatibility
• [] defineConfig
• [] FullConfig
• [] @apply -> not sure yet