v0.2.0

Added

• add the exact TE and TM modes of three-layer slabs (#14)
• add the full-vector finite-difference mode solver, with shift-and-invert Arnoldi (#16)
• add mirror walls to the vector mode solver, and validate its corners against Hadley (#20)
• add group index, dispersion, loss and mode tracking (#21)
• add exact multilayer slab modes and leaky waves by transfer matrices (#22)
• add a PML to the vector mode solver for leaky modes (#23)
• add the effective index method, with its error against the vector solver (#24)
• add bends: an exact bent slab, and bent cross-sections in the vector solver (#26)
• add a vector mode's full fields, power and coupling into another mode (#28)
• add Marcatili's approximation, validated against the vector solver in its regime (#29)
• add planar profiles by 1D finite differences, with a PML (#30)
• add the studio's mode viewer, with sweeps over wavelength and width (#31)

Documentation

• add examples, each reproducing a published result (#18)
• add the banner, logo and README badges (#19)
• add the project site, method write-ups and example outputs (#25)
• describe 0.2 as released (#35)