add CMake include and use its list for fonts

[yehoshuapw]

Add method to work with InfiniTimeOrg/InfiniTime#1097
to CMake files.

[yehoshuapw]

I didn't realize in advance (never really used CMake before. always used plain make) that creating a variable will make it global,
so if you disapprove of the naming - I can change things in both places.

[JF002]

I've just tried these changes but it doesn't seem to work for me :/

[100%] Linking CXX executable infinisim
/usr/bin/ld: CMakeFiles/infinisim.dir/home/jf/git/PineTime/src/displayapp/screens/WatchFaceDigital.cpp.o: warning: relocation against `jetbrains_mono_extrabold_compressed' in read-only section `.text'
/usr/bin/ld: CMakeFiles/infinisim.dir/main.cpp.o: in function `hal_init()':
/home/jf/git/InfiniSim/main.cpp:871: undefined reference to `jetbrains_mono_bold_20'
/usr/bin/ld: /home/jf/git/InfiniSim/main.cpp:871: undefined reference to `jetbrains_mono_bold_20'
/usr/bin/ld: /home/jf/git/InfiniSim/main.cpp:871: undefined reference to `jetbrains_mono_bold_20'
/usr/bin/ld: /home/jf/git/InfiniSim/main.cpp:871: undefined reference to `jetbrains_mono_bold_20'
/usr/bin/ld: CMakeFiles/infinisim.dir/home/jf/git/PineTime/src/libs/lvgl/src/lv_core/lv_obj.c.o: in function `lv_init':
/home/jf/git/PineTime/src/libs/lvgl/src/lv_core/lv_obj.c:207: undefined reference to `jetbrains_mono_bold_20'
<<And many more errors>>

I'm not a CMake Guru either, but here's something we can try if your solution does not work : Implement the font generate Cmake code in a CMake function in a new file. Pass "source" and "output" directories as parameters to this function. Then, we should be able to include the function and to call this function from both InfiniTime and InfiniSim with correct arguments.

[NeroBurner]

closed in favor of #29

But thank you for the PR and the time you spent 🙇