feat(game): add smart dialog handling, rejecting conflicting answers to same dialog

Resolves #57.

docs: add missing documentation

fix(game): make skills api safer by treating dash correctly and allowing only player skills

Merge pull request #55 from Rutherther/feat/contracts

Add contract system

feat(game): split nostale apis into safe, unsafe, add contracts usage

Merge branch 'main' of github.com:Rutherther/NosSmooth

Merge pull request #52 from Rutherther/feat/optional-wrapper

Add optional wrapper

docs: add not in range, nullable wrapper docs

Merge pull request #51 from Rutherther/feat/easy-api

Add easy apis for various things

feat(game): add inventory api

Merge pull request #8 from Rutherther/game-objects

Game objects

feat: add events for character skills