Updated docs and added constants to tracker

doc/files/getactorbonerelativetranform.txt

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+#title GetActorBoneRelativeTranform [RCBasic Doc]
+#header Function GetActorBoneRelativeTranform( actor, bone_index, t_matrix )
+
+Stores the local transform of a bone in t_matrix
+
+NOTE: This is only for actors that use skeletal animation (ie. *.b3d, *.x, *.ms3d, and actors created from Anim8or files)
+
+