Command confirmation client-side dialog

Extends CommandAttribute to support prompting for confirmation on the
client before sending the message.
LockCommand Confirmed

LockCommand confirms with client-side dialog before locking a room.
Migrate SendMessage UI Logic

Moves message display logic into chat.ui.js. Commands are stored in
array and lookup format.
Updated SignalR and WebApi packages.
Fixed other missing packages.
Added jabbr feed
Updated livestamp.js
Manually applied PR from SignalR
- Applied https://github.com/SignalR/SignalR/pull/2772
Patched issue with SignalR js
Removed livestamp map file.
Audio and Toast notifications for Nudge event
Toast notification appends roomName if present.
Added '<3' as alias for :heart:
Changed Regex to allow pulls to show as well as issues

This will allow pull requests to be shown like issues.
Merge pull request #1060 from khellang/patch-1

Changed Regex to allow pulls to show as well as issues
Merge pull request #1059 from khellang/patch-3

Added '<3' as alias for :heart:
Fix #1064 - Make lobby room list have pointer cursor
Merge pull request #1069 from JabbR/lobby-cursor

Fix #1064 - Make lobby room list have pointer cursor
Merge branch 'nudge-notifications' of https://github.com/nerdfury/JabbR into nerdfury-nudge-notifications
Merge branch 'client-side-dialogs' of https://github.com/garysharp/JabbR-Fork into garysharp-client-side-dialogs