Restructure cppeditor right-click menu

From IRC:

Wow, the latest Qt Creator has a really bloated right-click menu, taking up the whole screen, and spilling into 2 pages. Are stuff like "Show preprocessed code" really used often enough to be shown outside of a submenu?

I don't suppose the right-click menu is configurable by the user?

What it needs is be more contextual. If I have a symbol highlighted, I should only see items related to symbols. Rn like 20% of menu items are relevant when I just want to Rename Symbol or Find References To Symbol it didn't use to be like this

and

I would also add (when a symbol is selected): Fold Comments, Unfold Comments, Open Include Hierarchy, Find Unused Functions, Analyze File With Clang-Tidy, Analyze File with Clazy, Reparse Externally Changed Files, Update Stale Clang Entries, Open .clangd Config File, Run Test, and a few more . All of these should be in the general context menu when the user right-clicks an empty space. Not in the "symbol selected" menu."