Set mapper font on install

[iLPdev]

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.

[iLPdev]

Indeed, someone else recently had this same need and SlySven opened Mudlet repo issue #4031 about it.

[iLPdev]

Once Mudlet PR #4038 is mergd, then add set font function to discMapper install routine.