Cace

Common

- Convert to raw strings to remove deprecation warning

Common

- Execute xschem from the schematic directory

Common

- Add a simulation summary for the `ngspice` tool

Common

- Add reserved variable `netlist_source`

CLI

- Allow parameters to be specified via `--parameter` as a pattern
- Add `--skip-parameter` to skip certain parameters
- Applied after parameters have been queued via `--parameter`
- Also allows the use of patterns

Common

- Implement custom scripts for the `ngspice` tool
- `script` specifies the Python script
- `script_variables` specifies the output variables
- Improve various error messages
- Variables in `collate` and `plot` entries can be specified with or without bit vectors (`[a:b]`). For now bit vectors are unused.
- A collate condition can still be used in a plot (but won't be displayed in the legend).

Documentation

- Added a tutorial for custom scripts using the `ngspice` tool