Added a way to modify scaling, translation, and rotation logic using manipulationlogic class

[hossambasiony1]

Similar to objectmanipulator, boundscontrol.cs now supports custom scaling, translation, and/or rotation logic using handles.

Steps for creating custom logic:

1. Create your own class that inherits from manipulationlogic class
2. Add the manipulation logic in Setup() and Update()
3. Assign the new class for "manipulationLogicTypes" variable in the inspector for the boundscontrol script for whatever manipulation you wish to modify.

Also updated changelog and package.json accordingly.

[AMollis]

Can you also please undo some of the "access modifier" changes made in https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/715/files

• Change protected virtual internal void OnHandleSelectExited back to internal
• Change protected virtual void TransformTarget() back to private

Update being protected is fine....since a private Update can be mistakenly hidden and break Unity function events, if someone extends the class.

[AMollis]

/azp run

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[AMollis]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).