Kept a bit on the trade shop mode.

- Fixed the crash when removing all of an item type when trading.
- Fixed the check for the item existence when Adding a trade.
- Made the trade price possibly different from the standard price
which is quite logical when you buy something full price but pay
less when trading it against other wares.
- Removed the debug trade from the actual game and added trades
in the debug shop instead.

The trade mode is almost functional now. Only need to show clearly
the trade conditions.
Backported a small fix from Allacrost in the animation code.

Half of it was already there, but the map sprite wasn't.
Menu mode small additions.

- Changed a bit the world map cursor y offset.
- Made the menu main options only loaded once,
  thus not resetting the cursor position on Reset() calls,
  and made the entries without content be disabled.
- Add better Quest log entries, now the \n in text boxes is working fine.
  (Thanks Ikarus!!)
Made use of the world map and quest log entries in game!

It's so great to see those in use. :)
IT translation update thanks to BioHazardX :)
Fixed a typo in the LICENSES file pointed out by Zabin :)
Made the hero looks wondering what's happening before the first wolf encounter.

Also move slightly a tree that was annoying.
POT + fr translation update.