Hotfix: Bump dependency version

• Fix #2
• Update dependency to VisualScripting 1.7.2

• Fix #1
• Add LinkMerge dependency
• Update Unity Atoms depencency
• Remove necessity of adding package's asmdef in Bolt wizard for events nodes (still required for variable nodes)

Changelog:

• Remove Bolt.Community.Addons dependency
• Test integration, improve documentation
• Test build, with Mono and IL2CPP backend

Known issue

• Build with IL2CPP backend doens't work

This contains base nodes to work in Unity Visual Scripting (or Bolt) with Atoms.
Be careful, this version has not been fully tested yet