game.sav versioning and sanity

* game::save, game::load: moved iostream stuff to gamesave.cpp

* seperated misc / weather / location / killcount / player chunks into
  individual lines, and parse on a line-by-line basis. This makes .sav more
  resistent to complete breakage from adding a monster, or even a player data
  variable ( if those variables are added to the end of the variable hairball ).

* Implement versioning support; if a major change is made to the format, it is
  possible to load previous save versions.

All of these changes will allow easier conversion of individual classes to json
  serialization.
Remove #includes for not included stuff
Monsters now live on your drive platter as json strings.
Actually include a required header
Reshuffle / optimize pico* helper funcs
Cleanup
item::save_info: save 1 line json-serialized chunk instead of serialized stringsteam hairball
item::load_info: autodetect appropriate format: if it's json, parse as such
disable features not present in upstream
game::serialize: cleanup
Fix patch mistakes
Fix patch mistakes
patch related build errors: really fixed this time
Features not present upstream: remove
sync to upstream
remove unimplemented function
Merge save versioning and jsonizing some game save stuff.
Trim various bits of dead code.