Fix and update of AssaultCube project in Code::Blocks (for Windows).

What the commit does:
1. adds curl libraries for mingw from http://curl.haxx.se/gknw.net/7.34.0/dist-w32/curl-7.34.0-devel-mingw32.zip ;
2. adds to the linker "wldap32" and curl libraries;
3. adds "-t" parameter to the client compiled in debug mode, in order to it will start in windowed mode;
4.  adds "-D_DEBUG" option to debug modes, in order to get more debug informations;
5. adds icon also to AC server and master binaries;
6. lets to see debug info in console from client compiled in debug mode (removed "-mwindows" and added "gdi32" library to the linker);
7. adds missing jpegenc.h, modelcache.h, scale.h headers to the project.