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update 'building expansion' setting for included default town templates.
restructure default structure pack
update cluster value for default included structures;  should reduce
frequency of two large structures close together, and reduce the
frequency of them spawning next to towns.
add randomized loot to chest in village smith template
add preview images for most structures
fix outhouse template; change gold block to chest+nuggets.  add
dulciphi's mayor mansion template and add tavern template to small town
structure lists.  add screenshot for dulc' mayor mansion.  update
default structure pack with all new changes.
clean up lots of debug.  Fix an issue that was causing cluster value to
be improperly calculated (doubling the value of some structures,
counting some structures out past the cutoff distance, basically fubar).
update villager spawn #'s in default town templates
more default cluster value updates.  also fix included windmill template
add trapped chest meta rotation mapping
add rule to handle new skull tile-entity data format; rotation
supported.
fix sign post blocks not generating properly. will need structures
rescanned for complete fix.
fix up sign post duplication problems