Fix design rule violations of FETs

DF.4c and Mn.1

Add helper functions for proper pinout using GDSFactory

Proper pin out using GDSFactory features

Proper pinout using GDSFactory features

Make sure routing works properly still after moving

List available processes

Catch the case in which the name is missing in the process spec

Initial file creation

Adding an exception which catches wrong tech names and prints a list
of available technologies.

It was WAY too noisy

We also need files for defining the analog stuff, which isn't really
supported by LCLayout and seems to mess it up

Moving the technology specs from Danube over to LibrePDK

Removing redundant code from Danube River, moving it into a LibrePDK
helper function and removing redundancies within LibrePDK

Delete commented code

Adding proper ports for routing

Adding a via stripes class

Adding functionality for creating via stripes into its own object

Adding methods for adding via pads which can be routed