YouTrack support for Harvest Time Tracker

This extension adds YouTrack integration for Harvest Time Tracker extension (https://chrome.google.com/webstore/detail/harvest-time-tracker/fbpiglieekigmkeebmeohkelfpjjlaia).

Functional:

Adds Harvest tracker button to ordinary issue view and agile issue popup
Adds one-way (H -> YT) time tracking synchronization
works within 25 hours (syncs yesterday if triggered in first hour)
can be triggered by extension button
normally runs every hour automatically
if entry is in progress - tries to sync in 10 min
can update synced entries

Notes:

For initial config see extension options
Harvest entry notes should start with YouTrack issue id: XYZ-123
YouTrack entry type can be set from Harvest task. Obviously, YT should contain it in list. "No Type" by default.
YT work entry always will be set by current logged in user
Entry will be updated each sync attempt (is changed) even if in progress.
Next sync time is also available in the title of the browser button