add unity behavior package & examples

add behavior tree implementation

AI/ProjectSettings/BehaviorSettings.asset

@@ -0,0 +1,26 @@
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AI/ProjectSettings/EditorBuildSettings.asset

@@ -9,5 +9,6 @@ EditorBuildSettings:
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AI/ProjectSettings/ProjectVersion.txt

@@ -1,2 +1,2 @@
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AI/ProjectSettings/QualitySettings.asset

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@@ -116,19 +61,4 @@ QualitySettings:
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