New Setting panel

[tcitworld]

Bottom left is getting too crowded.

Needs to handle

• Existing settings
• Defining a default calendar for creating new events Defining a default calendar #1835
• Free/Busy view Improvements for Free/Busy UI #39
• Customize reminder type for automatically generated birthday events Customize reminder type for automatically generated birthday events #130?

[georgehrke]

There is a WIP PR by Marco in the nc/vue repo: nextcloud-libraries/nextcloud-vue#1286

[szaimen]

Lets continue in #5892 :)