Refactor of W3SRCE module

[ukmo-ccbunney]

Refactor the W3SRCE module to receive and process arrays of spectra and associated arrays from caller.
Requires:

• Handling of arrays defined on full domain (NSEA) vs local processor domain (NSEAL)
• Temporary arrays will need expanding
  • Implement chunking to keep temporary array size manageable (and also to mimic existing functionality)
• Initially wrapping calls to source term subroutine calls in loops (until individual routines have been ported)

Prerequisites:

• Tidy up #ifdef's in W3SRCE #42

TODO:

• Sort out FPI variable. Currently calculating ISEA for each loop iter. Does FPI get used for next iteration? i.e. do I need to pass it OUT from W3SRCE?
• Sort out temporary arrays being passed to W3SRCE due to slicing (e.g. CG, WHITECAPPING, etc)

[ukmo-ccbunney]

Some refactors that need noting in final PR:

• New TILE sized arrays for mapping of local seapoints to full grid seapoints. (JSEA -> ISEA).
• W3SRCE now loops over tiles are seapoints
  • To keep source term subroutines working as before, these are wrapped in sepoint loops
  • As source term subroutines are accelerated on GPU, it is expected they will be refactored to receive arrays of spectra.
• VAOLD/VAoldDummy not used in w3srce. Removed. VAOLD used by PDLIB, but not in w3srce.
• DELX, DELY and DELA not used. Removed.
• REFLEC and REFLECD scalars removed - passed in REFL[CD] arrays instead. Calculation now done in w3srce
• D50 and PSIC scalars removed. Passing whole arrays.
• TMP[1234] scalars removed and passed in arrays direct.
• VSIO/VDIO/SHAVEIO now optional arguments (only for PDLIB)
  • LSLOC test on VSIO/VDIO now done in w3srce.
  • UPDATE: These are problematic as VSIO and VDIO are not allocated if LSLOC is True. This makes passing them into W3SRCE difficult. Maybe if I don't slice them?
• A new loop added to end of main chunk loop to copy local grid variables back to full grid (e.g. USTAR)
• WHITECAP, TAUICE and TAUBBL 2D arrays have been split into multiple 1D arrays to avoid temporary variables when slicing.