v0.15.0-beta.2

• (bridge) Fixed building with nocrypto tag.
• (bridge) Fixed legacy logging config migration not disabling file writer when file_name_format was empty.
• (bridge) Added option to require room power level to run commands.
• (event) Added structs for MSC3952: Intentional Mentions.
• (util/variationselector) Added FullyQualify method to add necessary emoji variation selectors without adding all possible ones.