Reorganised files, added construction

I finally got round to organising those Resources and System folders to
be all one folder with a new name and some files combined.

One include was moved to the main Pawn include folder (Which I will get
a link up for pastebin soon, I was going to release that on the forums
but I got banned (for a silly reason))

Fixed some other things, mainly just small exploitable bugs.

Started work on the constructable items, they are pretty simple and
don't save at the moment, but they will improve over time.