Removed memory search library

No longer used
Removed old trading post api

No longer used
Removed JsonNet folder, new reference via nuget
Removed session key reader

No longer used
Added new item repository for the search
Added GW2.NET
Added new trading post api

Contains the new item repository. TradingPostApiOfficial.cs is going to
be renamed soon.
Added new search service class
Removed now unused stuff, also fixes.
Packages updated

Probably not used, clean up will be later
Update to the new api