WIP: Normalize and refactor signal-slot connection in Pstable

[shlyakpavel]

Original text:
This PR refactors the signal-slot connection in the Pstable class
It's not about old code being an old-style connection, but also about the connection not being normalized as described in https://github.com/KDE/clazy/blob/master/docs/checks/README-connect-not-normalized.md
However, I'm worried that the signal (even after my changes) is overloaded. Crazy emits warning https://github.com/KDE/clazy/blob/master/docs/checks/README-overloaded-signal.md and although the tooltips seem to work I'm unsure if that it works as originally intended
Text after debugging:
void toolTip(QPoint where, int col); is never emitted in the entire code. I have checked with debugger, breakpoint inside the slot was never triggered, even with tooltips wherever I found them. So, the question is: what is this code

[tsujan]

DO NOT MERGE: ....

GitHub has "Convert to draft" on the right pane ;) Please use it!

about the connection not being normalized as described in

That's about the old syntax. Please use the new syntax instead of the old one, if there is any.

EDIT: Oh, you've already done it in your draft.

[shlyakpavel]

İ already use new syntax in this PR. However, the more I try to understand this part of code the less I really get