add further sources to pspice symbols

[ferdymercury]

voltage-dependent current source. Just for simulation. Structure cloned from ISource and Voltmeter_DC directly.

all pins passive.

voltage-dependent voltage source:

arbitrary behavioral source:

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All contributions to the kicad library must follow the KiCad library convention

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

• Provide a URL to a datasheet for the symbol(s) you are contributing
• Provide a screenshot of the symbol(s) from the symbol editor with the pin types visible
• Check the output of the Travis automated check scripts - fix any errors as required
• Give a reason behind any intentional library convention rule violation.

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[myfreescalewebpage]

@ferdymercury thanks, no comment to do.
Joel