Replace projects.h by proj_api.h

Fortran-Proj (v1.0.0) uses the fortran iso_c_binding module for the following functions implementation:
    pj_transform -> fproj_transform
    pj_init_plus -> fproj_init
    pj_free -> fproj_free
    pj_strerrno -> fproj_strerrno;
    The  "fproj_transform" function provides in/output interface for point data, 1D array and 2D array.