v9.2.0

Added

• Markdown editing support by @vmiklos in #5918

Fixed

• Authorization in template field endpoints by @rikled in #5915
• Resized the settings iframe to its reported height by @timar in #5910
• Post message origin verification by @elzody in #5905
• Remove redundant stream cleanup by @nicfab in #5868

Other

• Temporarily test only against Collabora nightly by @elzody in #5897
• Development dependency updates