replace mute via role with discords timeout

[zaanposni]

should be fairly easy to do in the punishment handler. do not grand mute role but use the new timeout function. (D.NET labs 3.6.1)

Discord limits this to 28days so we will have to wait until that limit is raised or implement a check to increase the limit in MASZ every day or so.

further things to do:

• remove mute stuff from features command
• remove mute stuff from guildconfig (backend and frontend)
• change strict permission mode from MANAGE_ROLES to MODERATE_MEMBERS or whatever the new permission is called

[zaanposni]

we can also import existing timeouts on guild register similiar to the import ban process.

[zaanposni]

fixed in v3 release branch