Refactor sidebar tools tab

It’s going to be like the tools tab of tiddler info
Add import button
Fixes for file input styling
Fixes for import button position
Add description for github ribbon
Update button image sizes
Add plugin blocklist

Starting with blocking the old fullscreen plugin
Trim sidebar tools

Just got to add a theme button
Switch to "tw-tagged-" prefix for CSS tags
Docs update
Merge remote-tracking branch 'upstream/master'
Merge pull request #718 from BramChen/master

Update chinese translations
Merge remote-tracking branch 'upstream/master'
Add chinese translations for import button
and update upgrader messages