Rtsim npc fixes and changes

• By opening this merge request, you agree to release your code and all other changes under the GPL 3 license and to abide by the terms set by this license.

• Migrations have been added if applicable (migrations are always necessary for removing/renaming item asset files)

• Significant changes of this merge request have been added to the changelog.

• New formula for hire pricing, adventurer level goes from 0 to 3, 0 being greenhorn, 3 being experienced:

  • A day: 60 * 2 ^ (adventurer level)
  • A week: 300 * 2 ^ (adventurer level)

• Sentiment increase when you save a downed npc. And decrease on damage. No reports generated for these events, i.e it won't spread to other npcs.

• Fixes captains turning toward sounds and target.