Latest Ramp build

[cjcolvar]

Ramp build includes:

• https://github.com/samvera-labs/ramp/pull/497
• https://github.com/samvera-labs/ramp/pull/506
• https://github.com/samvera-labs/ramp/pull/496
• https://github.com/samvera-labs/ramp/pull/507
• https://github.com/samvera-labs/ramp/pull/504
• https://github.com/samvera-labs/ramp/pull/511
• https://github.com/samvera-labs/ramp/pull/510
• https://github.com/samvera-labs/ramp/pull/512
• https://github.com/samvera-labs/ramp/pull/515
• https://github.com/samvera-labs/ramp/pull/521
• https://github.com/samvera-labs/ramp/pull/520
• https://github.com/samvera-labs/ramp/pull/518

PR also turns on the playback rate control for all ramp players in Avalon. Resolves #5863