Clean up the ENDOOM lumps (lumps/endoom*.lmp) by removing extraneous
text and by making the colors more consistent and hopefully easier to
work with.
The rendering is pixel to pixel identical (no visible change) based on
Chocolate Doom's display on exit.
A new ENDOOM lump that:
1) Looks more like the Freedoom logo seen on the splash screen.
2) Has information about the Freedoom website, copying (license)
credits and development builds.
The singleplayer ENDOOM lump has also been fixed as it was using the wrong URLs (website doesn't have a "www" and soulsphere's https still has certificate issues).
This ENDOOM lumps were created in Playscii and edited by @mc776 with ENDEDIT.
