Remove get for getters & properties where applicable

[fengalin]

Note to application developers

Applications developers should use fix-getters-calls to ease migration of their applications. If you also wish to change your get functions definition to comply with the standards implemented here, use fix-getters-def.

Object

This is an attempt at fixing gtk-rs/gir#963.

Dependencies

• gir PR.
• fix-getters.

The last repository is a pair of tools to automate manual code getters definitions and call sites update. Please take a look at the READMEs in this repo. They explain the assumptions and decisions I had to make to achieve this. Of course, these assumption are all subject to debate. The repository also provides a crate which implements getter renaming rules. See the discussion in the gir PR.

Content

This PR consists in the following commits with different reviewing needs:

• I had to resolve conflicts in auto-generated code as a result of get prefixes removals. They can be found in this commit. I believe some of them might be subject to debate.
• gir is updated in this commit. Nothing special here, discussion should occur in this PR.
• The regen produces many changes in this commit, but those changes result from automatic rules. I did several iterations at the changes and at the functions which were kept unchanged, but it's most possible that I overlooked something. I think agreeing on the rules explained in fix-getters-rules and the changes to gir should cover most of the concerns though.
• Manual code is automatically modified using the fix-getters tools in this commit. If we agree on what is described in the READMEs, I think we should be covered for this.
• Final manual adjustments can be found in this commit. There are not many of them, so it shouldn't be a problem to review.

Base + a request

This is based on a snapshot of master and I will keep this as a basis until we reach the decision to merge this because it's quite time consuming to update. If / when we decide to merge, I would like that no branch be merged in neither gir nor gtk-rs until we get this merged completely.

I'll update gstreamer-rs when we come close to a merge decision.

[fengalin]

Requires some manual changes I didn't catch yet...

[fengalin]

Thought I should clarify: this is WIP in the sense that it can't be merged as is because:

• It depends on other projects changes / release (see initial comment).
• I wish we would discuss the premises on which I based these changes and fix-getters in particular.

Other than that, it's ready :)

[sdroege]

Looks all good to me otherwise. Thanks :)