Update fontconfig configs for macOS bundling (openscad#5191)

fonts-osx/conf.d/10-hinting-slight.conf

@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
+<fontconfig>
+  <description>Set hintslight to hintstyle</description>
+
+  <match target="pattern">
+    <!--
+      This sort of configuration is available on the major desktop environments
+      and we don't have to break it with "assign" unconditionally. however, we
+      want to set something for others. So we use "append" here to get this working
+      in both cases so that most clients would takes a look at the first place only.
+    -->
+    <edit name="hintstyle" mode="append"><const>hintslight</const></edit>
+  </match>
+</fontconfig>

fonts-osx/conf.d/10-scale-bitmap-fonts.conf

@@ -1,9 +1,14 @@
 <?xml version="1.0"?>
-<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
+<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
 <fontconfig>
-
+  <description>Bitmap scaling</description>
+<!--
+  If font is bitmap, calculate scale factor.
+  Note that color bitmap fonts have scalable=true, while
+  non-color ones have scalable=false.  Both groups have outline=false.
+  -->
 <match target="font">
-  <test name="scalable" compare="eq">
+  <test name="outline" compare="eq">
     <bool>false</bool>
   </test>
   <edit name="pixelsizefixupfactor" mode="assign">
@@ -13,10 +18,20 @@
     </divide>
   </edit>
 </match>
+<!--
+  For non-scalable bitmap fonts (ie. non-color), skip
+  minor scaling if hinting is enabled.
+  -->
 <match target="font">
+  <test name="outline" compare="eq">
+    <bool>false</bool>
+  </test>
   <test name="scalable" compare="eq">
     <bool>false</bool>
   </test>
+  <test name="hinting" compare="eq">
+    <bool>true</bool>
+  </test>
   <edit name="scalingnotneeded" mode="assign">
     <and>
       <less>
@@ -30,20 +45,7 @@
     </and>
   </edit>
 </match>
-<!--
-  So far we determined the scale factor.  Now, check and if
-  scaling is NOT desirable, just reset the scale factor to 1.0.
-  -->
 <match target="font">
-  <test name="scalable" compare="eq">
-    <bool>false</bool>
-  </test>
-  <test name="pixelsize" target="pattern" compare="less">
-    <double>64</double>
-  </test>
-  <test name="hinting" compare="eq">
-    <bool>true</bool>
-  </test>
   <test name="scalingnotneeded" compare="eq">
     <bool>true</bool>
   </test>
@@ -55,7 +57,7 @@
   If we *are* going to scale, go ahead and do it.
   -->
 <match target="font">
-  <test name="scalable" compare="eq">
+  <test name="outline" compare="eq">
     <bool>false</bool>
   </test>
   <test name="pixelsizefixupfactor" compare="not_eq">

fonts-osx/conf.d/10-sub-pixel-rgb.conf

@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
+<fontconfig>
+  <description>Enable sub-pixel rendering with the RGB stripes layout</description>
+<!--  Enable sub-pixel rendering --> 
+  <match target="pattern">
+    <!--
+      This sort of configuration is available on the major desktop environments
+      and we don't have to break it with "assign" unconditionally. however, we
+      want to set something for others. So we use "append" here to get this working
+      in both cases so that most clients would takes a look at the first place only.
+    -->
+    <edit name="rgba" mode="append"><const>rgb</const></edit>
+  </match>
+</fontconfig>

fonts-osx/conf.d/10-yes-antialias.conf

@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
+<fontconfig>
+  <description>Enable antialiasing</description>
+  <match target="pattern">
+    <edit name="antialias" mode="append"><bool>true</bool></edit>
+  </match>
+</fontconfig>

fonts-osx/conf.d/11-lcdfilter-default.conf

@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
+<fontconfig>
+  <description>Use lcddefault as default for LCD filter</description>
+<!--  Use lcddefault as default for LCD filter -->
+  <match target="pattern">
+    <!--
+      This sort of configuration is available on the major desktop environments
+      and we don't have to break it with "assign" unconditionally. however, we
+      want to set something for others. So we use "append" here to get this working
+      in both cases so that most clients would takes a look at the first place only.
+    -->
+    <edit mode="append" name="lcdfilter">
+      <const>lcddefault</const>
+    </edit>
+  </match>
+</fontconfig>

fonts-osx/conf.d/20-unhint-small-vera.conf

@@ -1,6 +1,7 @@
 <?xml version="1.0"?>
-<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
+<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
 <fontconfig>
+  <description>Disable hinting for Bitstream Vera fonts when the size is less than 8ppem</description>
 <!-- 
 	The Bitstream Vera fonts have GASP entries suggesting that hinting be
 	disabled below 8 ppem, but FreeType ignores those, preferring to use