compress fonts using zlib

- smaller
- better
- ugly big-endian workaround no longer necessary

src/gui/fonts.cpp

@@ -22,7 +22,7 @@
 
 #include "fonts.h"
 
-const unsigned int* builtinFont[]={
+const unsigned char* builtinFont[]={
   font_plexSans_compressed_data,
   font_liberationSans_compressed_data,
   font_exo_compressed_data,
@@ -38,7 +38,7 @@ const unsigned int builtinFontLen[]={
   font_unifont_compressed_size
 };
 
-const unsigned int* builtinFontM[]={
+const unsigned char* builtinFontM[]={
   font_plexMono_compressed_data,
   font_mononoki_compressed_data,
   font_ptMono_compressed_data,