Remove 32-bit configuration from the project

TL;DR: *Win32* config removed from the .SLN, `CMakeLists` updated as well, 32-bit related #ifdef's deleted.

I want to hear what Travis has to say about all this, since I'm not sure if I messed something in the *CMakeLists.txt* file. I also fixed the GameViewer issue related with game selection in a sorted list:

> *Nickz:* When i boot a game from the list of games ordered by name the game the emulator plays is actually the game that had the same position in the non-ordered list, not the one on which i clicked on. Could someone verify this?