Use SVG graphics to draw chess pieces instead of a custom font. This should fix
the problem where some android devices ignore the requested font so the chess
pieces are drawn as two overlapping regular letters.
This should also make it easier to add alternative piece sets in the future.
Automatic board flip based on "player name" is only supposed to happen when
loading a new game or similar. If you for some reason want to have the board
flipped compared to the "player name" orientation, it is annoying that the board
flips back every time you toggle analysis mode.
