Fixes & improvements:

* use `.child` instead of string concats on paths
* remove unnecessary `limit(999999)` for queries with filters
* use `.get` instead of `.query` to get all data
* using `skip` and `limit` args of `GetAllTypeNoTypeFieldMeshFiltered`
* use `==` instead of `in` operator in `RemoveSMBIOS` and `GetSMBIOS`
* use `.count` insetad of `.get` in `getDbStats`
* use `.get` instead of `.query` in `getPlugins`, custom sort function