SimpleMsgPlugin

Added:

• Added new command msgnotify
• Added new command msgprop
• Added new command mail

Fixed:

• Added notification about an incorrect command
• Fixed bug with canceling message sending in case of an invalid nickname case
• Fixed bug with incorrect notification sound settings in new Minecraft versions

Changed:

• Removed command changesound
• Removed command changevolume
• Updated to version Minecraft 1.21.11
• Updated to version 1.7.4