Remove support for non-TTF fonts

This patch set removes support in TWRP for the old .dat file
format as well as support for the AOSP style fonts in header
files. We need TTF for scaling.

Note that the old AOSP style header font is still supported in
minui which is not used by TWRP.

Change-Id: I6124a3333d479f1fc668138f7e32c4be9b519552
diff --git a/gui/devices/480x800/res/ui.xml b/gui/devices/480x800/res/ui.xml
index 49c4bb9..c406e66 100644
--- a/gui/devices/480x800/res/ui.xml
+++ b/gui/devices/480x800/res/ui.xml
@@ -14,9 +14,9 @@
 	</include>
 
 	<resources>
-		<resource name="font" type="font" filename="RobotoCondensed-Regular.ttf" size="20" fallback="Roboto-Regular-20" />
-		<resource name="mediumfont" type="font" filename="RobotoCondensed-Regular.ttf" size="20" fallback="Roboto-Regular-20" />
-		<resource name="filelist" type="font" filename="RobotoCondensed-Regular.ttf" size="20" fallback="Roboto-Regular-20" />
+		<resource name="font" type="font" filename="RobotoCondensed-Regular.ttf" size="20" />
+		<resource name="mediumfont" type="font" filename="RobotoCondensed-Regular.ttf" size="20" />
+		<resource name="filelist" type="font" filename="RobotoCondensed-Regular.ttf" size="20" />
 		<resource name="fixed" type="font" filename="DroidSansMono.ttf" size="16" />
 		<resource name="twrplogo" type="image" filename="twrplogo" retainaspect="1" />
 		<resource name="main_button" type="image" filename="menu-button" />