Dino Bollinger authored Oct 03, 2020 and Richard Gobeille committed Oct 05, 2020

Previous to this commit, the game would hijack the sprite, wall and sector
arrays to store the label data temporarily, which would get copied into
freshly allocated arrays once the scripts were fully parsed.

This lead to the maximum number of labels depending on MAXSPRITES.
This coupling is now removed, and an independent limit MAXLABELS
has been introduced, which is currently set to 16384.

Additionally, the limit is now checked before character data is loaded
into memory, rather than afterwards, preventing out of bounds accesses.