Refactorings

[ChristophWurst]

We all know it. You read some code and you think omg why is it done like that? We can do better that this. Let's use this ticket to collect those pain points. We won't work on them right away. It's more a collection of code smells to be picked up as time allows.

• Refactor reminder back-end to use a QB mapper server#30166
• \OCA\DAV\DAV\CustomPropertiesBackend should use the query builder or a QBMapper server#30389
• Send invitations for shared calendars server#26668
• Make all php classes strict #17
• Refactor CalDAV backend to use QBMapper server#30439
• Modernize backends dependencies #22
• Analyze and fix code for "causal reads" #24
• Use IQueryBuilder::executeQuery and IQueryBuilder::executeStatement mail#6619
• Use \OCP\DB\Types instead of column type strings in migrations mail#6620

[tcitworld]

Added sabre-io/dav#1368 so that we can have proper types when implementing Sabre's interfaces.

[github-actions]

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