GitLab

Let's hope we don't make them loose it D:

This allows one to debug wrong colliders in-engine.  Quite helpful if
inkscape messed up the SVG again ...

Control the player with WASD like a pro gamer.

Add plumbing for the most basic player:

- A `Player` component to mark the entity which is the player.
- A `Player` resource which holds the entity ID of the player.
- A `draw_tmp_player_system` to draw the player as a circle (for now).
- A `create_player` function to create the player entity.
- Update the `moving_system` to put the camera at the player position.

The camera system sets the transform of the canvas.  The pixel coordinate of
the camera position is centered in the canvas.