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Use 1.4**.0** to comply with Semver so that package is correctly discovered by OpenUPM

• Improve performance when adding / deleting / updating several assets at once
• Fix dependencies should be collected recursively
• Fix referencers are lost on an object when moved / updated

• Add tooltip with full path
• Put special message when selecting assets that are outside of the Asset folder (non browsable)
• Fix missing LICENSE.meta error message