Fab automation (#2)

- Use KiKit for fab automation
- Add splitflap scripts for exporting pcb pdfs, and switch to splitflap script for 3d rendering (for consistency with fab automation)
- Added support in 3d rendering scripts for soldermask & silkscreen colors, option to skip virtual components
- Added silkscreen to base and screen pcbs for commit and date info

electronics/scripts/dependencies.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+set -e
+
+if [[ -z "${GITHUB_WORKFLOW}" ]]; then
+    >&2 echo "Aborting! This script is meant to be run in CI (Github Actions) only. It may modify/damage your system configuration if run outside of CI."
+    exit 1
+fi
+
+set -v
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+sudo add-apt-repository --yes ppa:kicad/kicad-5.1-releases
+sudo apt-get update -qq
+sudo DEBIAN_FRONTEND=noninteractive apt-get install -y kicad inkscape poppler-utils xdotool recordmydesktop python3-dev python3-pip
+
+# KiKit is installed via pinned git revision to get "new" CLI with support for V-Cuts layer specification. TODO: switch to release version once landed.
+sudo python3 -m pip install psutil kikit==1.0.2 xvfbwrapper
+
+mkdir -p ~/.config/kicad
+cp /usr/share/kicad/template/fp-lib-table ~/.config/kicad/
+cp /usr/share/kicad/template/sym-lib-table ~/.config/kicad/
+
+cp "$DIR/config/eeschema" ~/.config/kicad/
+cp "$DIR/config/pcbnew" ~/.config/kicad/
+
+# Install ImageMagick policy that allows PDF conversion (safe in CI because we control all inputs/outputs)
+sudo cp "$DIR/config/policy.xml" /etc/ImageMagick-6/policy.xml