Component shape editor

[jdryg]

Extra button in the component library dialog which will open a new editor window.
From there the user should be able to move I/O pins around (e.g. place output pins on the left, top or bottom).
It would also be nice if the user is able to alter the shape of the component (e.g. turn it into a trapezoid for MUXes, V shape for ALUs, etc.)