Updates to font scripts and fonts documentation

buildroot/share/fonts/get-bdf2u8g.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+#####################################################################
+# get-bdf2u8g.sh for Marlin
+#
+# This script downloads, patches, and builds bdf2u8g
+# License: CC-SA
+#
+# Execute from within buildroot/share/fonts
+#
+#####################################################################
+
+HERE=$(pwd)
+
+[[ $HERE =~ 'buildroot/share/fonts'$ ]] || { echo "Change to buildroot/share/fonts to run $(basename $0)" ; exit 1; }
+
+# Download u8glib
+curl -LJO https://github.com/olikraus/u8glib/archive/master.zip
+unzip u8glib-master.zip >/dev/null 2>&1
+
+# Patch and build bdf2u8g
+cd u8glib-master/tools/font/bdf2u8g
+patch -p0 <../../../../u8glib-bdf2u8g.patch bdf2u8g.c >/dev/null 2>&1
+make >/dev/null 2>&1
+mv bdf2u8g ../../../../
+
+# Clean up
+cd -
+rm -rf u8glib-master*
+
+cd "$HERE"