Refactor User and DB handling (#123)

fix copyright date

Add more user tests

More user tests

More user tests

Start refactoring user tests

Docs

Fix lint

Fix db fixtures init in tests

Fix models test

Fix loading fixtures

Fix ineffasign

Fix lint

Fix integration tests

Fix init of test engine creation

Fix user related tests

Better handling of creating test enging

Moved all fixtures to db package

Moved all fixtures to db package

Moved user related stuff to seperate package

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/123

pkg/models/task_relation.go

@@ -18,6 +18,7 @@
 package models
 
 import (
+	"code.vikunja.io/api/pkg/user"
 	"code.vikunja.io/web"
 )
 
@@ -83,7 +84,7 @@ type TaskRelation struct {
 
 	CreatedByID int64 `xorm:"int(11) not null" json:"-"`
 	// The user who created this relation
-	CreatedBy *User `xorm:"-" json:"created_by"`
+	CreatedBy *user.User `xorm:"-" json:"created_by"`
 
 	// A unix timestamp when this label was created. You cannot change this value.
 	Created int64 `xorm:"created not null" json:"created"`