More human readable syntax for circuit definition

[ceremcem]

Copied from #131 as suggested.

A more human readable syntax may be possible. Here is the circuit in the README:

from skidl import *

# Create part templates.
q = Part("Device", "Q_PNP_CBE", dest=TEMPLATE)
r = Part("Device", "R", dest=TEMPLATE)

# Create nets.
gnd, vcc = Net("GND"), Net("VCC")
a, b, a_and_b = Net("A"), Net("B"), Net("A_AND_B")

# Instantiate parts.
gndt = Part("power", "GND")             # Ground terminal.
vcct = Part("power", "VCC")             # Power terminal.
q1, q2 = q(2)                           # Two transistors.
r1, r2, r3, r4, r5 = r(5, value="10K")  # Five 10K resistors.

# Make connections between parts.
a & r1 & q1["B C"] & r4 & q2["B C"] & a_and_b & r5 & gnd
b & r2 & q1["B"]
q1["C"] & r3 & gnd
vcc += q1["E"], q2["E"], vcct
gnd += gndt

generate_netlist()

and here is the equivalent circuit:

my-circuit = 
    iface: "A B OUT Vcc DGND"
    bom:
        Q_PNP_CBE: "q1 q2"
        R:
            "10K": "r1 r2 r3 r4 r5"
    netlist:
        Vcc: "q1.e q2.e"
        DGND: "r5.2 r3.2"
        1: "r4.1 r3.1 q1.c"
        2: "r4.2 q2.b"
        OUT: "r5.1 q2.c"
        3: "q1.b r2.2 r1.2"
        A: "r1.1"
        B: "r2.1"

This is a simple JSON object (actually, LSON object: Livescript JSON) which you can define every kind of schematic. You can find additional details here: https://github.com/aktos-io/aecad/blob/master/docs/creating-circuit.md and you can play around at https://aktos.io/aecad

Best