Ensure const-correctness for hypergraph element properties storage

[SpectraL519]

• Aligned the hyperedge descriptor type to allow:
  • Proper implicit conversion from non-const to const variant
  • Comparison between a const and non-const variants
• Refactored the hypergraph class to define and utilize const and non-const element descriptors based on the hypergraph's constness
• Relaxed the c_hypergraph concept to allow various value/type categories of the hypergraph class
• Introduced helper typedefs to easily extract the typedefs from a hypergraph type in generic contexts
• Aligned the algorithm implementations to work with the new, aligned graph implementation
• Additional cleanup of the GL module

[SpectraL519]

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