remove some unused old source
fix up button and checkbox gui-elements activating when GUI first
opened.  May need to revisit in the future for other elements.  Updates
#151
add screenshots/preview image for all structures in default pack
update client-proxy to enable a debug resolution setting upon game
launch
minor updates to instruction manual
update tooltip comment on survival-mode structure builder to use
lang-registry.  Closes #155
erm..fix typo in localization lookup for survival mode builder tooltip
key
minor updates to instruction manual
Merge branch '2.3' into 2.4
lots of work on town-template definition and wall-stuff setup
enable the loading portion of town templates.  need to code the actual
parsing of the information from string lines list
add intended list of tunes to include for bard; need to trim, re-encode,
and possibly crop
finalize set of tunes to add for bard.  re-encode, and crop to make them
small enough to include.  Should probably offer a second set as a 'full'
bard-tune pack.
add dulciphi's biome list, to better config the default templates
update town-template parser.. to actually parse things.  
a few other minor cleanups (imports, formatting)
add power-drain mechanics to flywheel control blocks
slightly re-order power update order in torque tiles
update default values for torque tile power loss
quite a bit of work updating instruction manual with information on new
features
update name for windmill control block.  add localization entry for
windmill control and blades to language file