Roll back kotlin version to 1.5.30

Voice element -> Audio element

Fix setGroupBan unmute member, add setGroupAdmin support, add custom music share support. Close #149

Fix build & deps update

Upgrade to mirai 2.8.2 and other dependencies

Upgrade gradle

Merge patch

Merge branch 'master' into dev

Merge pull request #144 from sandtechnology/master

Fix bug for no return cache image

Tweaking cache image logic

Fix image cache checking

Update kotlin version to 1.5.20

Adapt to 2.7-M2

Fix ExternalResource leaking