1.14.0 Rework caching

• Reworked cache subsystem
  • Added cache command
  • Added /cachez server route with details about cache
  • Added ETag header in server when cache is using (response with 304 when data is not changed)
  • Replaced --cache option with --no-cache and --cachedir
  • Changed --cachedir (former --cache option) default to .discoveryjs-cache
  • Improved background data cache updating
  • Fixed issues with corrupted data responding due to read from a cache that's not fully written or uncomplete because of
  • Introduced cache dispatcher that encapsulates cache related logic
  • Removed cache logic and options from data command
• Added default favicon.ico to server
• Added support for darkmode option in config (for index and model)
• Fixed building to avoid "Download" and "Reload without cache" buttons in built result
• Fixed streaming data to client (not through cache) when data contains async values