Allow having bindings referencing const Properties

[phyBrackets]

Initial work for issue #29

[LeonMatthesKDAB]

Good change, do we really need the ConstPropertyNode class?

[LeonMatthesKDAB]

@phyBrackets Can you please rebase this and your other PRs.

CI should then pass again :)

Edit: Nevermind, I added the option to do it through Github, so can do it myself :)

[LeonMatthesKDAB]

Hm, enabling clazy seems to have generated some new warnings through this PR. Good thing that's actually now failing CI 🤔

Please fix them before this PR can be merged.

[phyBrackets]

Hm, enabling clazy seems to have generated some new warnings through this PR. Good thing that's actually now failing CI 🤔

Please fix them before this PR can be merged.

So that is easy to fix, but we still want to see if we want the ConstPropertyNode or not :)

[LeonMatthesKDAB]

So that is easy to fix, but we still want to see if we want the ConstPropertyNode or not :)

I definitely want to be able to reference const Properties, I just wonder why we need an entirely new Node type for this?

Could you try modifying the existing PropertyNode type to accept const references? Or is there any reason it really has to be its own class? At the moment it just seems like a lot of code duplication...

[LeonMatthesKDAB]

This already looks pretty good, but I think we can get away without the IsConst conditionals.