Fixed the crash when file folder wasn't already created

Better crash handler for save/load commands

Added back load companions command + button in encyclopedia

Added error handling

Add reset and resetfull commands back

Total refactor of the code

Missing from previous versions :
- Companion command to import/export all your companions at once (will be my priority)
- Family managment
- The other commands, no idea if I'll do them, those were requested initially by some of you, but they bring more problems than anything

Improvements :
- Skill and character XP (the important thing to read)
=> TLDR : If you do not modify booleans, what you export is what you import
=> There are now multiple options. If you do not play with the different options, what you export will be exactly what you import. Which means your character XP and all your skill XP will be the exact same between your import and export
=> If you want to change a skill rank, you'll have to set useRealSkillXp to false. It will set every skill to the requested rank, without any additional XP (which mean, as if you just reached this skill rank). I made in case you decrease a skill rank, it could lead to problem with this additional XP.
=> The character level is now totally separated from the skill. Without going into details, in the game, the character has a raw XP value, which is partly used to determine your skill values. But the opposite is not true, your skills have no impact on the raw XP of the character. As you do modifications on the skills, I have no way of knowing which raw XP and level your character should be. I made a homemade auto calculation which is done only if autoCalculateGlobalXp is set to false. It will always be an (bad?) approximation, which is why it's not enabled by default.

- Fixed the attributes doing weird stuff on import
- Traits are now managed with their own XP level, so if you were almost rank 2, you'll keep your progression
- You can now marry anyone, even rulers, all the controls are bypassed
- Relations should be applied more propely, the delat between what you write and what you get is way lower than before
- Settlements are assigned only once, if you already own a fief, you won't get a notification each time
- I tried to improve the "in-file" documentation, feel free to say if it's not enough
- Many under-the-hood stuff that you do not care

Level and XP from save file optionnal

Re-re-fixed xp from skills

Re-fixed level setters