Arcane tower update

[h2]Changelog[/h2]

🌟 New:
- New defensive room : Arcane tower (see bellow)
- New events.
- Improved pathfinding to try to avoid fire.

⚖ Balance:
- Reduce the difficulty of boarding events on easy difficulty level

🎆 Graphic:
- Fixed some missing noses on humans
- Added decoration into rooms
- Slightly updated the game logo

🐞 Bugfix:
- Dwarf inflicting 0 melee damage
- Fixed a bug where the enemy ship would sometimes not flee when running out of ammo

💻 UI:
- Improved room health display
- Crew members positions are automatically saved at game start

[h2]Arcane tower[/h2]
The arcane tower is a defensive room that destroys enemy projectiles and inflicts damage on enemies climbing onto your ship. It's a medium-sized room (2 tiles) that benefits from the magic experience of the crew member(s) who activate it. Upgrading it reduces its charge time.

[h2]Updated roadmap[/h2]
With this release, I have updated the roadmap of the game until its release.