Ensure consistent naming of title fields (#528)

Remove task text and namespace name in migration

Fix lint

Add migration for namespace title

Fix renaming namespace name to title

Rename namespace name field to title

Drop text column at the end of the migration

Add migration for task text to title

Rename task text to title

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/528

pkg/models/namespace_test.go

@@ -32,7 +32,7 @@ func TestNamespace_Create(t *testing.T) {
 
 	// Dummy namespace
 	dummynamespace := Namespace{
-		Name:        "Test",
+		Title:       "Test",
 		Description: "Lorem Ipsum",
 	}
 
@@ -52,7 +52,7 @@ func TestNamespace_Create(t *testing.T) {
 	assert.True(t, allowed)
 	err = dummynamespace.ReadOne()
 	assert.NoError(t, err)
-	assert.Equal(t, dummynamespace.Name, "Test")
+	assert.Equal(t, dummynamespace.Title, "Test")
 
 	// Try creating one without a name
 	n2 := Namespace{}
@@ -92,13 +92,13 @@ func TestNamespace_Create(t *testing.T) {
 	assert.True(t, user.IsErrUserDoesNotExist(err))
 
 	// Try updating without a name
-	dummynamespace.Name = ""
+	dummynamespace.Title = ""
 	err = dummynamespace.Update()
 	assert.Error(t, err)
 	assert.True(t, IsErrNamespaceNameCannotBeEmpty(err))
 
 	// Try updating a nonexistant one
-	n := Namespace{ID: 284729, Name: "Lorem"}
+	n := Namespace{ID: 284729, Title: "Lorem"}
 	err = n.Update()
 	assert.Error(t, err)
 	assert.True(t, IsErrNamespaceDoesNotExist(err))