Phased Solver

Seriously re-structure the architecture in preparation for different types of Phases (PhaseRegex!)

Bugfix for the PhasedSolver app.

Make the Phases more generic - now subphases can contain any subsets of the cubits involved in the whole phase.

Solving the white cross and white corners do work now.

Solving the white cross works now.

PhasedSolver app: bugfixes.

minor

Initial commit