* Move jsonsl to third-party
This treats it as proper 3rd-party code to which our warning and style
settings don't extend.
* Move wildmat to third-party
This treats it as proper 3rd-party code to which our warning and style
settings don't extend.
* Fixup Xcode project to match new project structure
* Modernize cache.cc: Convert tr_cache to a class
* Modernize cache.cc: Replaced ptrArray with vector
* refactor: Cache now takes a tr_torrents reference
* refactor: add Key type to Cache
* refactor: avoid std::back_inserter
* refactor: add Cache::flushOldest()
