add more fonts

partially related to an issue when displaying non-Latin characters
however a true fix isn't coming yet as I haven't figured out a way
to load glyphs during run-time as needed

src/gui/fonts.cpp

@@ -0,0 +1,33 @@
+#include "fonts.h"
+
+const unsigned int* builtinFont[]={
+  font_plexSans_compressed_data,
+  font_liberationSans_compressed_data,
+  font_exo_compressed_data,
+  font_proggyClean_compressed_data,
+  font_unifont_compressed_data
+};
+
+const unsigned int builtinFontLen[]={
+  font_plexSans_compressed_size,
+  font_liberationSans_compressed_size,
+  font_exo_compressed_size,
+  font_proggyClean_compressed_size,
+  font_unifont_compressed_size
+};
+
+const unsigned int* builtinFontM[]={
+  font_plexMono_compressed_data,
+  font_mononoki_compressed_data,
+  font_ptMono_compressed_data,
+  font_proggyClean_compressed_data,
+  font_unifont_compressed_data
+};
+
+const unsigned int builtinFontMLen[]={
+  font_plexMono_compressed_size,
+  font_mononoki_compressed_size,
+  font_ptMono_compressed_size,
+  font_proggyClean_compressed_size,
+  font_unifont_compressed_size
+};