Revisions to do before GZDoom 4.6.0's release

[nashmuhandes]

• Redo Heretic - Shadows' TITLE
• Fix seams in Plutonia's TITLEPIC
• Move the sun closer to the center in TNT's TITLEPIC?
• Redo entire left extension of Heretic's FINAL1/2
• Smoothen out seams on the right extension of Hexen's FINALE1 (fix the seams on the torchlight glow, and wrong perspective on a floor brick seam)
• Fix seam in the left extension of Hexen Death Kings' CREDIT
• Fix cloud seams in Doom 1/Ultimate Doom TITLEPIC, right side
• Improve Doom 1 registered's CREDIT
• Improve burning smoke cloud to the right side of Doom 2's TITLEPIC

[nashmuhandes]

All done