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Add symbols for ideal voltage, current, and controlled sources

Graham Keeth requested to merge gkeeth/kicad-symbols:v8-spice-sources into master

This MR adds 4 new spice sources: I, V, FSOURCE (current-controlled current source), and HSOURCE (current-controlled voltage source). This supersedes !3579 (closed), taking the original commit from that MR and updating based on the feedback I gave there (the submitter was unfortunately not responsive). I kept the original submitter's commit and then added a fixup commit that updated to v8, moved to a new library, and applied the other feedback.

V and I, set up as DC sources with amplitude 1:

Screen_Shot_2024-02-23_at_6.48.57_PM

HSOURCE and FSOURCE, set up as dependent sources with gain 1, controlled by the current through a voltage source VCONTROL:

Screen_Shot_2024-02-23_at_6.49.13_PM

With this MR merged, we now have symbols for the full range of ngspice independent and dependent sources. Here's a family portrait:

Screen_Shot_2024-02-23_at_6.47.37_PM

Here is a v8 project that can be used to test the symbols in this MR, with a sim workbook.

new-source-demo.zip

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