Modelbaker

In this release you can find a lot of shiny new features:

* We have supernice icons in the toolbar and in the menu
* The map canvas extent is set to the one obtained from the model.
* Model lookup improvements for GUIs like Generate Project, Export and Import:
- Partial match instead of simple string completion improves looking for models
- Avoid of listing more than one version of models in the completion dropdown
- More flexible model lookup with completion dropdown by clicking on line edit or deleting everything from it (displays e.g. all possibilty when empty)

* Improvements for Bag of Enum
* Do not display "[None]" when there is no unit type
* An option to choose if the import tid column should be created by the database is now available in the GUI

This release includes many new features

* Show the source repository for models in autocompletion list.
* It shows an *add feature* button on relation reference widgets. This allows to quickly add a missing entry into lists where required.
* Support for bag-of value lists. In such a scenario it a checkable list of items will be shown.
* It allows hiding fields via [a new meta-attribute `hidden`](https://github.com/opengisch/projectgenerator/blob/a001bab57d2e92b723a3c7ba072a1b77bf87d13a/projectgenerator/tests/testdata/toml/hidden_fields.toml)
* A new option to create a basket column
* Many other small improvements

This is a bugfix only release

* Avoid error when selecting a GPKG file to save.
* Avoid appending '.gpkg' extension when not needed.

* Respect inheritance configuration also on data import (207)
* Allow ignoring legend nodes when ordering layers (226)

* Allow exporting to .itf, .xml and .gml (211)
* Fix data import with delete existing checkbox (220)
* Show correct feature count (206)

Preprocess python files for pylupdate and utf-8

pylupdate treats any string as latin-1, unless it's inside a trUtf8 call.
On the other hand, trUtf8 is deprecated by Qt itself.
So we send all the python files with trUtf8 instead of tr to pylupdate but
still code and release their tr variants.

Revert "Use UTF-8 for translated strings"

This reverts commit 2b7c8d59bd444a1e26411b6c59586b1705a2b59f.

Only push translations on master branch