Merge branch 'ModelReductionTasks' of https://gitlab.kitware.com/andrew.wilson/iMSTK into ModelReductionTasks

REFAC: Interaction factory switched to enums

See merge request iMSTK/iMSTK!473

BUG: Include fix

See merge request iMSTK/iMSTK!472

REFAC: Renames and fixes for TaskGraph, graphviz node coloring

See merge request iMSTK/iMSTK!471

BUG: Template solver fix + uncrustify

See merge request iMSTK/iMSTK!467

Physics update refactor

See merge request iMSTK/iMSTK!458

# Conflicts:
#   Examples/DeformableBody/DeformableBodyExample.cpp
#   Source/DynamicalModels/ObjectModels/imstkFEMDeformableBodyModel.h

BUG: Fix compilation errors with VS 2015

See merge request iMSTK/iMSTK!465

BUG: turned off gravity when creating internal force model to avoid doubling...

See merge request iMSTK/iMSTK!461

BUG: turned off gravity when creating internal force model to avoid doubling gravity; changed indices of fixed nodes to 0-based; changed default material property

REFAC: template solvers

See merge request iMSTK/iMSTK!455

Refactoring imstk libs: splitting and separation of roles

See merge request iMSTK/iMSTK!457

Clean up inter-library dependencies (some are already propogated through immediate dependencies)

BUG: fixed a bug in NewtonSolver that limits num of iterations to 1; added test case for NewtonSolver; renamed file imstkNonlinearSystem to be consistent;

BUG: Fix compilation error in oneToOneMap

See merge request iMSTK/iMSTK!454

Move the impl to avoid compilation errors
occuring due to recent use of forward declerations