Helios: Models refactorings
Helios: More models refactorings
Helios: Adds Helios-Commands-Tools
Helios: Commands refactorings
Helios: add Helios-Commands-Browser
Helios: References refactorings
Adds ClassMigrated announcement
Helios: listen for ClassMigrated announcements
Adds BlokClosure >> receiver
AnnouncementSubscription use #valuable: instead of #block: (deprecated)
Adds MessageSend class
Adds Announcer >> #unsubscribe:
fixed Announcer >> on:send:to:
Helios: Announcement refactorings: use #on:send:to:

Helios: Announcement refactorings: use #on:send:to: #2

Helios: Announcement refactorings: use #on:send:to: #3

Helios: Announcement refactorings: use #on:send:to: #3

Helios: Announcement refactorings: use #on:send:to: #4

Helios: Announcement refactorings: use #on:send:to: #5

Helios: Announcement refactorings: use #on:send:to: #6

Helios: Announcement refactorings: use #on:send:to:
Helios changes:
- better documentation widget
- new HLMethodReference class to reference methods