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Von mises elastoplastic analysis#26

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manavbhatia wants to merge 19 commits intomasterfrom
von_mises_elastoplastic_analysis
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Von mises elastoplastic analysis#26
manavbhatia wants to merge 19 commits intomasterfrom
von_mises_elastoplastic_analysis

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This PR adds capabilities for elastoplastic analysis. This requires capability for storage of material point data (akin to quadrature point where the constitutive laws are enforced). Currently, von Mises yield criterion is implemented along with unit tests to check tangent stiffness.

-- rearranging ContextType in the template parameter list of member functions.
-- Bug-fixes for second derivative of vonMises stress
-- Refactoring of return mapping residual and Jacobian evaluations for von mises yield criterion
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