Review extension for gitlab.

File approving
This extension adds buttons for controling file approve:

Now supported two types of file approving:

1. Local. Approves available only on current PC.
2. Shared. Approves share via firebase DB.
   Note: You can specify you own URL and API key for firebase DB in the settings. The database should be accessible for read/write without authentification

Filtering
This extension provides 4 types of filters:

1. Moved files without content changes.
2. File with only changes fired by package renaming/moving.
3. File with only added/removed empty lines
4. Filter by file path pattern

Node: You can see the content of filtered files by clicking on this button(only when filtered files shown, see review panel):

The review panel

1. Shows review progress
2. Shows merge request stats: the count of approved files, the count of filtered files, total count of changed files.
3. Button for adding filter
4. Control for show/hide filtered files.
5. Control for show/hide already approved files.