Add rule-of-five to `IKMarkerTask` and `OrientationWeightSet`

[nickbianco]

Brief summary of changes

Adds move constructors, copy assignment operators, and move assignment operators to IKMarkerTask and OrientationWeightSet. This suppresses gcc compiler warnings complaining about no user-defined assignment operator when a user-defined copy-assignment operator is present.

ProbeMeasure issues a similar warning, but I think it can be ignored. It uses a Simbody macro to define custom copy assignment operators and copy constructors. The macro uses the terms shallowAssign and deepAssign to define its copy constructors, since these do not use the typical constructor syntax, gcc complains.

Testing I've completed

CHANGELOG.md (choose one)

• no need to update because...not user facing.

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This change is 

[nickbianco]

Thanks @aymanhab!