feat: CIF handling

[RobBuchananCompPhys]

This work aims to encompass much of the existing functionality of the CIFHandler and ImportCIFDialog interfaces. It does this via passing a pointer to a CIFContext (which is a node type alias for CIFHandler) between various nodes.
Together these form a sort of CIF-node "family".

• CIFLoaderNode: Initialises a CIFContext object and reads into it the contents of a .cif file.
• CIFConfigurationNode: Recieves and stores a CIFContext *, generating from it the unit cell species, molecular species, supercell species, and supercell configuration as output parameters
• CIFAtomicOptionsNode, CIFBondingOptionsNode, and CIFNETAOptionsNode operate on the context pointer and apply various settings to it (for instance removeAtomics, useCIFBondingDefinitions, and setMoietyRemovalNeta etc.`
• SetCIFAtomGroupActivity takes the CIFContext * and allows for activation/deactivation of chosen CIFAssembly CIFAtomGroup instances.

[trisyoungs]

As briefly discussed, it is probably worth having a separate Configuration-maker node for each type of crystal cell we're generating (supercell, non-periodic, full species etc.).