v18.0.0rc1

Release notes:

This is a major release of stellar-core that implements “protocol 18”.

Protocol 18 contains the following protocol changes:

• CAP-38: Automated Market Makers

Stability improvements

• Improve performance of transaction processing
• Herder: cleanup trigger ledger mechanism
• Do not call bucket manager shutdown twice. Removes bogus logging.
• Bump tracy to take change that disables building with -flto
• Minor fixes for issues detected by static analyzer
• Adjust default automatic maintenance to run faster (every 6 minutes). This reduces the load on the SQL backend (in particular the need to reclaim pages).
• Improve performance of bucket apply for captive core. Increases the chance that captive-core can restart without having to talk to history archives.

New features

• Add --enable-tracy-csvexport. Allows capturing Tracy counters in csv form.
• Add a new command to gather information on any given bucket.

Breaking changes

• Bump protocol version to 18. Disconnect clients older than 17.0.0