NEW: A text entry allows adding signals by name. This includes vectors
not in the signal list, which is useful for plotting calculated vectors
like `let AB=V(a)*V(b)`. It's also a faster way to add a signal if you
know its name already.
Fixes: lp:1851373
* https://bugs.launchpad.net/kicad/+bug/1851373
Improve dialog layout and fix UI policy issues with all of the dialog
boxes in the common, 3D viewer, CvPcb, and Eeschema code paths.
Updated the use of component to symbol.
File "rules" has instructional text as comments near top.
2) Convert all text files in repo to LF line ending form.
Any checkout done with "rules" in play will convert the working
tree to native line ending, while keeping repo as LF line ending.