Add font scaling back as an advanced preference for now.

This gives an opportunity for people to try it out and maybe improve it. It can be removed again before 1.18 if deemed unsuitable at that time.

data/advanced_preferences.cfg

@@ -160,5 +160,16 @@
     default=no
 [/advanced_preference]
 
+[advanced_preference]
+    field=font_scale
+    name= _ "Font size scale (experimental)"
+    description= _ "Scales all text up or down from the standard size for your resolution. Warning: Scaling text up may cause issues in the in-game sidebar."
+    type=int
+    default=100
+    min=80
+    max=150
+    step=5
+[/advanced_preference]
+
 #ifdef __UNUSED__
 #endif