Fides

* Changes acceptance criteria to accept steps independently of trust region refinement

* Improve 2D subspace performance for ill-conditioned problems

* Refactored code organization
* Improved Hessian Update initialization
* Refactored and improved logging
* Fixed bugs for empty subspaces and singular hessians

* Updates default algorithms after evaluation on benchmarks
* Adds single_reflect strategy
* Some minor updates to logging

* Fixes another bug for 0-dimensional subspaces
* Makes mixed truncation/reflection default option
* Adds option to refine steps via `trust-constr` optimization (enabled by default)
* Removes convergence based on too small delta
* Adds several dimension checks that should better safeguard against malformed user input.

* Fixed a bug to handle empty subspaces more graciously
* No longer require setting of dimensionality when initializing HessianApproximation
* Add a couple more dimensionality checks