fix parse error in sign.
add default tags for paintings, item frame
fix un-initialized sets in validation settings
fix comparison of structure names to ignore case
add checks for minY > 0 to both template selection, and individual block
validation and placement
rework parsing of strings -> sets.
enforce lower-case of biome-names from templates through parsing
remove comment
rework validation settings into a multi-type framework with individual
controlling validators with their own contained code.
fix basic parsing error
more basic parsing stuff
yet more updating to parsing code
spawning is working again, but still has a few quirks to sort out and
clean up...as well as writing 5-6 more validation types