v0.10.0: Call Me Maybe

What's Changed

• Add RequestDisplayMode action by @jlowin in #219
• Add HOST reactive variable and reactive variable docs by @jlowin in #220
• Split UI Elements into Display and Form Controls by @jlowin in #221
• Support callable tool references in CallTool by @jlowin in #222

Full Changelog: v0.9.1...v0.10.0