[DISC] Removing support for variable level boundaries

[WillLem]

The next version of RetroLemmini (most likely 3.1) will no longer support variable level boundaries.

It's currently possible to set the boundaries to anything, but the default values are the only ones that actually make sense, at least from an engine maintenance point of view. Allowing them to be set to anything (particularly the top boundary, the physics for which is notoriously difficult to perfect) just causes unnecessary problems.

Furthermore, whilst variable boundaries might be a fun thing to experiment with, it's unlikely to produce any particularly good levels.

So, let's go ahead and set these values to defaults program-wide. Then, I can address the top-of-level physics properly and make sure there isn't anything unintended happening.

This topic is to provide users, creators and maintainers with an opportunity to voice any concerns or add to the discussion at this stage, before the next version is released.

Your silence = this will go ahead as planned, any levels affected by this change will be disregarded.

[namida]

Rather than just disregarding it for existing levels, could they be padded / shrunk accordingly?