Set mapper font on install #115

Describe the bug
When using game-icon font symbols, sometimes it displays a character from another font unless the user explicitly specifies the game-icons font in map settings.

To Reproduce
Add brain icon to a room without the font specified in map settings.

Expected behavior
Corresponding character from game-icons is displayed for room.

Describe alternatives you've considered
If there is a way to force setting during install, that would be ideal. The font is installed automatically, and likely there is a a Mudlet function to edit profile settings. Alternatively, we will need to direct the user to select the font in mapper settings.