Adding FontAwesome as a soft dependency

[marcocadete]

I had a problem with remontoire not displaying font awesome icons, which made the areas where the icons should have been really big, causing remontoire to extend/overflow my screen.

I wasn't aware that FontAwesome was required to fix the issue, until Ken Gilmer informed me.

So having this as a dependency would probably help others not have to go searching for answers, even though the Regolith community is very responsive, friendly and helpful.

A screenshot of the problem:

[iamjameswalters]

I concur; Font Awesome was missing from my install (from PPA on top of Ubuntu), I had to go looking for this on my own.

[kgilmer]

This was fixed in 1.6