Modding system for Open Eggbert

Proposal of modding system for Open Eggbert

Open Eggbert Store will be involved too.

Similarly to Maven building system, every mod will be described in a xml file, but it will be packaged to a ZIP file ending with the extension ".egm" (like Open Eggbert mod).

<?xml version="1.0" encoding="UTF-8"?>
<mod>
   <modelVersion>1.0.0</modelVersion>
   <parent>
       <author>epsitec</author>
       <mod>legacy-blupi-1</mod>
       <version>1.0.0</version>
   </parent>
  <author>john-doe</author>
   <mod>legacy-blupi-1-with-minecraft-graphics</mod>
   <version>0.0.0-SNAPSHOT</version>
   <packaging>egm</packaging>
   <type>full</type><!-- level, sound, music, image8, image16, image24, image24x2, full, partial -->
   <featurelevel>2</featurelevel>
   <name>legacy-blupi-1-with-minecraft-graphics</name>
   <description>legacy-blupi-1-with-minecraft-graphics</description>
   <imports>
       <import>
       <author>john-doe</author>
       <mod>image24x2-minecraft</mod>
       <version>1.0.0</version>
       </import>
   </imports>
    
   <stores>
       <store>
           <id>releases</id>
           <name>john-doe-releases-store</name>
           <url>https://john-doe-store.com/releases</url>
       </store>
       <store>
           <id>snapshots</id>
           <name>john-doe-snapshots-store</name>
           <url>https://john-doe-store.com/snapshots</url>
       </store>
   </stores>
</mod>