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Additional parameters on simulation dialog



I prepared some changes in KiCad simulation dialog. They are about
additional simulation parameters. According to tutorial, which I've
found on website, I store them on GitHub repository in branch
"Sim_InitialConditions_SK" here:


Could you please have a look and do some review if possible? I'd be
grateful for feedback if these changes are OK. In future I'd like to
implement OP analysis using some controls I've added

Additionally I also prepared polish translation for new strings.

My aim was to make simulation with arbitrary initial conditions
possible (additionally I added other options). Right now it is possible
to enable checkbox UIC on TRAN tab, but there is no possibility to set
IC to any arbitrary value in element properties. I'm afraid it will
involve change in .sch format. Please take note that it is also
possible to define initial conditions for entire nodes instead of
capacitors or inductors (for example: ".ic v(11)=5 v(4)=-5 v(2)=2.2",
see ngspice manual, chapter 15.2.2). It is also a challenge. 

So in current state we can use for initial conditions results of .OP
analysis or default zero. 

From my point of view these are the topics, which should be taken into
account during review:
- in simulation code sometimes there is used '\n', sometimes "\r\n".
Maybe it should be unified? Is there a common definition for newline in
- I added .option savecurrents: someone added TODO that it doesn't
work. Maybe should we hide this control? 
- something happened to colours on dialog windows, see attached image.
I don't know what is it and how to fix it. seems to be unrelated to my
changes, but maybe I'm wrong? (this is visible on Ubuntu 18.04)
- some feedback regarding how to add IC field to capacitors, inductors
or nodes will be very appreciated ;)

Limitations of my changes:
- parsing SPICE .options is not implemented (in bool
DIALOG_SIM_SETTINGS::parseCommand( const wxString& aCommand ))

Best regards,

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