Hardcoded line termination character in SpiceParser (Windows issues)

[alape]

Environment (OS, Python version, PySpice version, simulator)

Windows 10 21H1 / Python 3.9.6 / PySpice 1.5

Expected Behaviour

SpiceParser.__init__() should correctly detect newline characters in the input string supplied via source and/or provide way for user to specify separator character(s).

Actual Behaviour

SpiceParser.__init__() always uses os.linesep (see Parser.py:829) as newline separator, which creates problems with parsing Unix-terminated netlist strings on Windows.

Steps to reproduce the behaviour

Attempt to parse Unix-terminated SPICE netlist via supplying SpiceParser with source option while running Windows.