Release candidate 1 for v5.1.0.

Highlights

This version release includes changes in following areas:

• performance improvements
• update of slinky
• vault UX improvements

Performance optimizations

• optimized state reads for perpetuals (#1678) (#1681) (#1691)
• optimized ContainsDuplicate (#1575)
• override of TimeoutPropose to 1.5s (#1751)

Update of slinky

• update slinky to include fixes for live-ness vulnerability and reduced logging (#1781)

Vault UX improvements

• change messages for vault orders to prevent flickering orderbook levels from vault orders (#1551) (#1664) (#1665) (#1602) (#1775)
• update vault deposits to emit transfer event (#1343)

Note: This release candidate also includes the hotfix for invalid short-term orders with non-zero TimeoutHeight < GoodTilBlock that was added to v5.0.6 (#1851) (#1856) (#1860)

This release is not state-compatible with v5.0.x.