[PROTON-1920] Update deprecations and enable deprecation warnings

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Done
• Fix Version/s: proton-c-0.25.0
• Component/s: proton-c
• Assignee: Justin Ross
• Reporter: Justin Ross
• Created: 27/Aug/18 23:22
• Updated: 06/Sep/18 15:45
• Resolved: 27/Aug/18 23:26

Description

• De-deprecate get and set context functions
• Add notes about deprecations conditioned on upcoming changes
• Deprecate functions no longer used after the introduction of the connection driver