This allows org.gnome.Sudoku.Devel and org.gnome.Sudoku to properly work with the right icons when installed, as well as be activatable by the Shell

Make it easier to read the selected number

Fixes #108

Fixes #109

Stop giving gresources to valac, we're already compiling them with meson
Add base_id
Rename application_id to app_id

The game includes all the components like the undo / redo stack and the
puzzle. The puzzle is the grid itself and its numbers, it's called
SudokuBoard in the code and lives in /lib/sudoku-board.vala

This commit is meant to reduce the ambiguity for players and bridge
the gap between the code and the UI. For example Reset Puzzle does not
affect the stack so it can't be called Reset Game.

Also lowers the summary to 35 characters for flathub

The height needs to be greater than the width for the window to look
good given that the headerbar takes a chunk of the height and the grid
is a square.
700 in height to align with the screenshots

Prepare moving them out of sudoku cell

Create the Picker subclass for the grid widgets

Dynamically connect the number picker to the selected cell instead of
each cell having their own

The cell was relying on the view anyways for the shortcuts, this lets us
assemble them all together

Dismiss doesn't always get called

We're always checking which is which. This should also allow us to
further diffenciate both of them later on. They're currently too hard
to tell apart.

We assume that if a user is using their keyboard to enter values and
earmarks they will not want the number_picker to obfuscate the view

Whenever it has the focus it blocks application shortcuts and takes over
tab navigation. We don't want either of those things.

Better reactiveness, particularly important for games.
This is a revert to our gtk3 behavior.

Avoid doing the same switch twice

Move the tarball link to the project wiki's build section.

Allows using them inside the number picker and the menu, side effect is
that they also now work in dialogs and modal windows.
Includes some cleanup and specializing the mouse events.

Fully revert 0b5b4878

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