Big changes (but only to structure)

So in this update I again did some major structure-wise changes. At
first, I structured IHProspekt source. Then I renamed client, editors
and server directory to actual project names, what are ProspektClient,
ProspektEditors and ProspektServer. And some additional things:
- Added Error Handler class to IHProspekt, what is easy to use,
efficient and advanced error handler.
- Fixed some bugs in Map Editor and saving/loading of maps.
- Moved Files class to IHProspekt (before it was in each project -
client/editors/server)
- Removed some unused references from each project (for example Lua51
was never used and same with System.Data)