Introduced RF material library to microwave plugins

Added test for HeatChargeSimulation
Added functionality to compute heat source from conduction simulation

Skip tests with warning

…al lumped ports

…ed additional tests to both rectangular and coaxial type lumped ports

…in post processing

…atibility

Make HeatBoundarySpec a derived class from HeatChargeBoundarySpec

added path integral plotting functionality

added convenience function for defining voltage path integral from end points

Signed-off-by: Lucas Heitzmann Gabrielli <lucas@flexcompute.com>

Merge develop into 2.8

…ate passing path_dir to methods

… the TerminalComponentModeler

Added Bayesian optimization, genetic algorithms, and particle swarm
optimization methods
Removed MethodRandom and MethodRandomCustom as had become redundant
Expanded DesignSpace with new support methods estimate_cost and
summarize
Redesigned interface with plugin to make it easier for users to batch
simulations for different design search methods
Automated batching of simulations when user provides pre and post
processing functions
Expanded testing for all new features

Design plugin redesign with Bayesian optimization

…or negative real parts

… equation relating polarization current density to electric field

…subsection

… produced

…ace extends into PML regions

Update IsotropicUniformMediumType

…uction

…etals

…velopment/debugging. also fixed some broken docstring links

…improved documentation for subdivide and removed some unused function arguments.

setting default loss for inductor to avoid second order pole at omega=0

added ability to snap lumped elements to grid boundaries, to improve accuracy when there are few cells

added convenience method for setting up monitors and path integrals for lumped elements automatically

added convenience functions for computing impedance and admittance of the lumped element.