Merge pull request #17 from AkiKurisu/dev/v1.5.1

Merge dev v1.5.1

Merge pull request #12 from AkiKurisu/dev_merge_dsl

Merge AkiBT.DSL

Update version to 1.4.9

Optimize memory

Dispose node and unbind all internal shared variables in behavior tree instance at runtime.

Duplicate node serialized data to recover class missing

Update version

Merge pull request #6 from AkiKurisu/dev_subtree

Add Subtree feature

Update package.json

Add new variable types

Add SharedVector2 SharedVector2Int  SharedVector3Int

Update readme