v2.9.0

• Add "push message" dialog to UI (#276 via #897 by @AlliotTech)
• Use system theme for default UI theme (#851 via #902 by @AlliotTech)
• Allow undo for delete message (#791 via #903 by @AlliotTech)
• Add drag&drop reordering for applications (#358 via #909 by @xavier-GitHub76)
• Fix UI warnings (#906 by @eternal-flame-AD)