Revert text image fading

[mothbeanie]

Changes:

This reverts the following commits:

• 29f05c41b1add3aeea3b6b870349020f6cd13b94
• f1bf1f683c459ac4de4de05f938587d196084dea
• a7b22919ae379c96001c8dcdb9f73c36d298f967
• 2ed1aac67d050f19f0a2170ac71f6fe19bb3f747

Recently, text images were changed to fade in with textboxes, where before they previously appeared after the fade. This created a charming effect where the images would appear to "load in" once the textbox finishes fading in. This behavior really complements the retro aesthetic the game is going for. Changing it to a fade is a needless change in direction, as it was not a bug in the first place and looked good already.

Additionally, custom levels have used text images (levelcomplete and gamecomplete) in creative ways by replacing them with something else to show as 'foreground' or as a cutscene image. Changing text images to fade has unintended consequences for levels that have utilized them in this fashion.

Current behavior, with fades (in English and Arabic):

https://github.com/TerryCavanagh/VVVVVV/assets/19874772/79d59cca-f2fe-4cca-9f0f-465ea3c1093b

https://github.com/TerryCavanagh/VVVVVV/assets/19874772/b6f55f57-73ed-4a12-896d-da575908db77

Without fades (behavior before today):

https://github.com/TerryCavanagh/VVVVVV/assets/19874772/0474803c-2a8a-49c1-98fb-a2b35aa5f7b1

https://github.com/TerryCavanagh/VVVVVV/assets/19874772/88344e25-9e43-4b87-89ea-47c881176c30

Legal Stuff:

By submitting this pull request, I confirm that...

• [x] My changes may be used in a future commercial release of VVVVVV
• [x] I will be credited in a CONTRIBUTORS file and the "GitHub Friends" section of the credits for all of said releases, but will NOT be compensated for these changes

[InfoTeddy]

We can disable fading if the graphics are customized.

[mothbeanie]

I mentioned that as an aside - I prefer the non fading behavior for all text images, customized or not. It looked good as it was