Feature/new ws manager

[Daniel1984]

Description:

solving silent ws client stop issue that is most likely causing bloomberg issues and other similar cases reported by go library users.

Breaking changes:

• n/a

New features:

• [x] new websocket manager to reduce complexity
• [x] multiple models updated to accept new fields from api

Fixes:

• n/a

PR status:

• [x] Version bumped
• [x] Change-log updated