spareparts-v0.1.0-beta1: first beta for initial release

Initial release, contains modules with some random components:

• descrete.scad: descrete logic for PCB
• microchips.scad: parametric microchips in DIP and SMD
• panel-mount.scad: sockets and other components for panel mount (modules with "pm" postfix)
• plugs-n-jacks.scad: plugs and jacks for wires
• sensors.scad: sensors
• arduino.scad: Arduino boards and shields

beta status: may contain some inaccuracy with some component sizing, some API params are subject to unify and change.