Moved plugin files in own dedicated folder - Rename to AXEL instead of AXEL Player

See merge request !1

- /Netscape4/Communicator/Program/Plugins/AXELPlayer.class
- /Netscape4/Communicator/Program/Plugins/AXELPlayerNP.xpt
- /Netscape4/Communicator/Program/Plugins/NPAXELPlayer.dll
- /Netscape4/Communicator/Program/Plugins/AXEL/AXELPlayer.class
- /Netscape4/Communicator/Program/Plugins/AXEL/AXELPlayerNP.xpt
- /Netscape4/Communicator/Program/Plugins/AXEL/NPAXELPlayer.dll