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viewport: Rewrite the ShumateViewport and all the Layers to synchronize around a common ShumateViewport widget

This allows to use a ShumateTile or ShumateLayer without a ShumateView.

This allows to zoom-in/out.

This allows to drag the view to move to another location.

Also make sure to load the right tile when requested.

This is required as we are reusing the tiles in the ShumateMapLayer

ShumateMarker is usable as-is to add widgets, simply add a GtkLabel to it to have a ShumateLabel equivalent.

It is just a simple ShumateMarker subclass, let the client set its style with CSS.

Create shumate-marker-private as some fields should not be set by the client but by the layer itself.

It is now a simple widget composed of two labels.

ShumateScale is now a simple widget composed of 2 labels.
It is now possible to show both metric and imperial units at the same time.

Also remove unused methods and reorganize the code

Make the Map Layer a simple GtkWidget subclass with recycling ShumateTiles
This allows the Map to be a simple widget, allowing to set its opacity and to overlay many of them.

This way, a ShumateTile can be added to another widget

This way, a ShumateView is a simple container of ShumateLayers

They are now generated by meson

It is not very useful.

Also align the coding standards with GNOME ones and add g_assert for private methods.

This allows us to keep the remaining code clean

It has been removed as of Gtk4 3.98.4

This allows to slightly improve the efficiency of each MapSource as downloading a tile from the internet is not the same as doing it from memory or from the filesystem.
Make the ShumateErrorTileSource render the tile for now.

Because the ShumateNullTileSource only exists for this.

This allows Gtk to take care of the rendering of the texture by itself and perform optimisations when necessary.