v0.8.0

Biggest update so far!
Basically, everything is new.

• Single click to execute action, double click to redirect
• Toot status is now shown (favourited, reblogged)
• No longer uses periodic fetching of following list but API call to check when needed
• Use background script to allow using Mastodon 302 redirects for toot resolving
• Use runtime messages to communicate between background / content script
• Use a custom implementation to detect inserted nodes (better reliability than MutationObserver)
• General optimizations/improvements
• Use delay to prevent API error 429
• Use accounts API to resolve handles
• Code restructuring