Remove forced ExCmdDemo recording on DSDA-UDMF/MapInfo wads

[elf-alchemist]

Somewhat experimental change that has consequences for demo recording.

This should completely fix demo recording for Eviternity II, without needing the mapinfo patch -- but also has the major fix of enabling normal demos (non-ExCMdDemo) for DSDA-UDMF/ZDoom maps. Thus allowing valid recording for DSDA-UDMF map sets, like NoSp4, as ExCmdDemos always fail analysis testing, being classified as "Other".

[rfomin]

These new demos will not be compatible with other ports or old versions of DSDA-Doom. We will need a new complevel for UDMF/MAPINFO demos.
If we add a new complevel, there is no reason to remove ExCmdDemo; analysis should be updated to support the new complevel.

[elf-alchemist]

I would not use the term conplevel, here, but if it just means putting these advanced, ZDoom-originated, features behind a user-provided CLI parameter or the like, I wouldn't object to it. But the current state of demo recording for these kinds of maps is extremely sub-bar for end users, it needs some important revision, and most solutions I can think of are tricky or include some major compromise (I may elaborate further, later). I will update this PR in a bit, I've noticed an issue with how it's currently laid out.

[rfomin]

I will update this PR in a bit, I've noticed an issue with how it's currently laid out.

The current approach won't work — these new demos won't be compatible. This defeats the purpose of a demo-compatible port.
We will need to add a new complevel (demo_version), after which we can make any changes or improvements we want.