Support for base UDMF implementation

[elf-alchemist]

Binary format	Woof	Retro	Zandronum	UZDoom	Odamex	Eternity	DSDA	EDGE Classic	Helion
Doom	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️	✔️
Heretic	-	-	✔️	✔️	-	✔️	✔️	✔️	-
Hexen	-	-	✔️	✔️	-	⚠️	✔️	-	-
Strife	-	-	✔️	✔️	-	-	-	-	-
Doom-in-Hexen	-	-	✔️	✔️	✔️	⚠️	⚠️	-	⚠️

• DSDA: Intentionally bombs out when reading Doom-in-Hexen format. Otherwise, fully supported internally.
• Eternity: Has full support for Doom and Heretic, Hexen mapping features are available via UDMF & ExtraData.
• Helion: Support for Hexen mapping features is currently under development for UDMF support.

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UDMF	Woof	Retro	Zandronum	UZDoom	Odamex	Eternity	DSDA	EDGE Classic	Helion
Doom	✔️	❌	✔️	✔️	❌	✔️	✔️	✔️	️✔️
Heretic	-	-	✔️	✔️	-	✔️	✔️	✔️	️-
Hexen	-	-	✔️	✔️	-	✔️	✔️	-	️-
Strife	-	-	✔️	✔️	-	✔️	-	-	️-

• Eternity: Does not support Hexen or Strife game type.

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Port-exclusive	Woof	Retro	Zandronum	UZDoom	Odamex	Eternity	DSDA	EDGE Classic	Helion
EDGE Classic	-	-	-	-	-	-	-	✔️	-
Eternity	-	-	-	✔️	-	✔️	-	-	-
DSDA	-	-	-	✔️	-	-	✔️	-	⚠️
ZDoom V1.26	-	-	✔️	✔️	-	-	⚠️	-	-
ZDoom V1.38	-	-	⚠️	✔️	-	-	⚠️	-	-

• DSDA: Feature-wise, the DSDA namespace can be described as a curated subset of the ZDoom namespace.