Release v2.0

[pavel-kirienko]

• The transfer-ID timeout for RPC response sessions must be zero #63
• v1.1: Override response transfer-ID #66 -- only storage space
• Switch to the new cavl2 used as a dependency instead of vendoring it.
• Add elaborated type aliases unless defined(__cplusplus).
• Update the README
• Check the migration docs

Stretch goals:

• Add earliest-deadline-first view of the TX queue #33
• Remove timed out sessions #41