Skill & tutorial

Ok, another skill with new features for the skill system. This one is the one you should keep for when you run out of stamina in middle of a fight. It increases your defense and allows you to convert the enemies hits into stamina. Hopefully, when the skill ends, you exchanged a few health points against a full stamina bar.
This skill brings two new features to the skill system :
- possibility to trigger events on certain fight events (you're hit, you dodge, ...)
- premature ending of the condition on certain events.

As usual, there are also potions of agility with the same effect.

I started to work on the tutorial. This is not a special level that teach you how to play the game, but tips that appears on screen on certain conditions. They should give you the basic knowledge you need to buy and equip stuff, speak with npc, well... anything you need to survive. The interresting thing with the tips is that they use a new cross fading effect when they appear/disappear over the game screen. This is not a real fading because you can only print one character on the console, so in the middle of the effect, you cannot see both characters overlapping. Instead, this is a two-phases fading. It's a hack but it brings some more life to the screen.