Tile editor updated

Hi everyone!

I have updated the application to version 0.9.250a.

This update includes improvements to the tile editor.

> Display the selected sprite in the editor window.

> Display multiple sprites when changing the draw size parameter.

> Ability to flip sprites horizontally, vertically or both (useful for saving sprite banks).

Another small update: It is now possible to autocomplete filenames in the console using the tab key.