Add OR Scene Objects and human models. Only one model can be assigned
texture now. Add test cases in Sandbox.

Deformable body sprint

Merging the deformable body sprint into refactoring branch

See merge request !81

Adds updateFunction to the NL system. Some style cleanup.

Trigger compilation error on macOSx

Vega filename was hardcoded in DeformableBodyModel.

In VegaMeshReader, keep a pointer to the vega mesh
within the volumetricMesh class, and use it when
initialising the deformable body model.

InsertNextTypedTuple needs to return a value or
compilation error on windows.

After rebasing on dynamics-sprint, the following
errors appeared:
- change from VecNf to VectorF
- wrongfully placed 'virtual' in MassSpringForceModel
- wrongfully placed '#endif' in MassSpringForceModel
- missing include in NonLinearSolver
- error in constructor in NonLinearSystem
- error in Eigen include in TimeIntegrator
- error in VTK remote address in External_VTK.cmake

Move force models implementation to ccp files

Adjust camera position and plane scale

Adds solver, maps to scene manager pipeline.
Enables different types of state updates.
Improves the example.

Adds unknown vector to nonlinear system.
Adds simplified nonlinear solver for testing

Adds comments in scene class and format changes

Sets displacement to the mesh vertices as sum of original positions and the current displacements

Adds connection b/n vega and deformable model tangent stiffness matrics

Clears runtime error that shows failure to create eigen vectors in problemState.
Small formatting changws.

Clears linker errors in solvers and force model.
Adds comments in the time integrator classes.

Clears compilation and linker errors in solver and TI modules.
Moved the code in TI to cpp.

Adds linear and nonlinear solver to the test example

Clears compilation errors in force model. Implements getForceAndMatrix in force models.
Adds get type in dynamical model. Adds get and set dynamic model in dynamic object.
Removes raw pointers in nonLinearSystem class.

Adds penalty based mesh to rigid contact handling. Adds contact force vector to deformable body model

Removing vega executables form cmake since they are not libraries

Adds driver code to test deformable models.
Clears a bunch of compiler errors in force model module.

Add initialization of Stiffness, damping, mass matrices and vectors.
Add updates for Stiffness, damping, mass matrices and vectors.
Adds update body states given the solution vector.
Adds loading initial states
Builds effective stiffness matrix

Consistent style enforcement in nonLinearSolver class

Make problem state a Vectord type. This will be templated in future

 Add method to update mesh form flat solution vector

Adds method to query stiffness matrix topology in the force models.

Add update state methods to time integrators. Separate classes for different types of time integrators.

Implements API for deformable Model: Initialization, read configuration, returning LHS and RHS of the system

Fix API for vegaMeshReader

Adds API for set/get states of the deformable object.

Enforce consistency with braces

 Remove smart pointers for eigen sparse matrices.
Add initialization to linearFEMForceModel.

Style changes to forceModelConfig class in class definitions