Define and associate .pyromod filetype with pyrogenesis on Linux and Windows.

The new pyrogenesis.xml file should go under
`$XDG_DATA_DIRS/mime/packages/` before running update-mime-database (see
https://www.freedesktop.org/wiki/Specifications/AddingMIMETutor/ for
more information).

Patch by s0600204 and myself.

This was SVN commit r21723.

build/resources/0ad.appdata.xml

@@ -76,4 +76,7 @@
     <content_attribute id="money-purchasing">none</content_attribute>
     <content_attribute id="money-gambling">none</content_attribute>
   </content_rating>
+  <mimetypes>
+    <mimetype>application/x-pyromod+zip</mimetype>
+  </mimetypes>
 </application>

build/resources/0ad.desktop

@@ -4,6 +4,7 @@ Name=0 A.D.
 Exec=0ad
 Icon=0ad
 Terminal=false
+MimeType=application/x-pyromod+zip;
 Type=Application
 Categories=Game;StrategyGame;
 Comment=A real-time strategy game of ancient warfare

build/resources/pyrogenesis.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
+  <mime-type type="application/x-pyromod+zip">
+    <comment>Pyrogenesis Modfile</comment>
+    <sub-class-of type="application/zip"/>
+    <generic-icon name="package-x-generic"/>
+    <glob pattern="*.pyromod"/>
+  </mime-type>
+</mime-info>
+