[update] optimize bone system and increase tickle mode

·The skeleton system is optimized, and unnecessary skeleton operation is limited in story mode. Only when the skeleton is massaged, it will move slightly and truly.
·For example, tibia (lower leg) can only rotate in plane relative to thigh.
·Add independent tickling mode, and experience it quickly!
·Failed to solve the threading problem. Tried to add collision mechanism, but the effect is not good. For example, in reality, the skin is elastic, and the close fitting of legs is a natural action. But the collision body can't simulate the elasticity, adding collision mechanism can avoid wearing the mold, but it will limit many positions that can be achieved in reality. The above optimization is made after comprehensive consideration.
·"Story mode" is suitable for most players. There will be no more wearing models here. The hand feeling of massage has also been greatly improved.
·"Free mode" is suitable for deep players. You need to be patient to pose as you want. The hand feel of bone rotation is also optimized.
·In addition, if you have any suggestions, you can add developer friends or leave a message in the community. Thank you for your support.