New features added/improvements made

4-phonon interactions.
Phonon-thin-film scattering.
Exact in-scattering correction due to phonon-isotope and electron-impurity scattering.
Scissor operation to the conduction band.
Distributed coarray of real-space, Wannier-rep electron-phonon matrix elements.
Improved method for electron-charged impurity scattering following Ganose et al. Nat. Comm. 12:2222 (2021) and Leveillee et al. PRB 107, 125207 (2023)
Portable precision using iso_fortran_env.
Building with CMake and fpm (fortran package manager).
Delta function evaulator is chosen outside of the internal summation loops over states.
Superconductivity app, superconda.
Set up unit testing with testify.
Set up Github actions.
Updated to epw v5.3.1.
(Experimental) Offloading to accelerators using OpenACC.
(Experimental) Interface between exciting and elphbolt + superconda.

Removed/no longer supported