Enforce TLS 1.2
Placeholder for TLS compression check
Update ALPN token (and internal references)
Update settings identifiers
Update existing error numbers
Add INADEQUATE_SECURITY error
Update frame type IDs
Two more TLS requirement placeholders
Start working on padding handling
More vestiges of unused frame type
Add END_SEGMENT flag
Start updating padding implementation
Markers for padding handling locations
Handle session-level padding (stream-level to come)
Remove unused members
Start handling padding for DATA frames
Finish off padding implementation
Typo fix
Update to handle new setting id size
Remove ability to disable flow control