Add Flatpak packaging for iDRAC6 console

- Manifest, desktop entry, metainfo, icon
- Direct Java launch (no javaws/IcedTea-Web)
- Bundles avctKVM.jar and native .so libs
- Parses JNLP for connection parameters
- sign-idrac.sh helper script

com.idrac6.console.metainfo.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>com.idrac6.console</id>
+  <name>iDRAC6 Console</name>
+  <summary>Dell iDRAC6 Virtual Console</summary>
+  <metadata_license>MIT</metadata_license>
+  <description>
+    <p>Console video pour Dell PowerEdge via iDRAC6.
+    Lance les fichiers .jnlp de l'iDRAC avec Java 8 et javaws.</p>
+  </description>
+  <launchable type="desktop-id">com.idrac6.console.desktop</launchable>
+  <provides>
+    <mediatype>application/x-java-jnlp-file</mediatype>
+  </provides>
+  <content_rating type="oars-1.1"/>
+</component>