chore: unify QtCreator fetching code with CI

[gikari]

Before this change, QtCreator fetching code from external directory was different from the one from CI scripts. You'd have to specify QtCreator version in two places, and the external fetch was more complex, requiring you to change file names and checksums for every platform once the version of QtCreator changes.

This change unifies the way to download QtCreator, while simplifying it. Only one place to set Qt

Some drawbacks:

• Qt Creator now unpacks to external source directory, requiring you to delete the dist dir, if you want a full clean build. In the most cases, since the downloaded files are binaries, that are stable, you would not want to do that often.
• Since Qt Packaging script is invoking CMake and comes from QtCreator distribution, we have to download the QtCreator outside the CMake build process, which makes things more complex. But we only need to do this once, in the CI, so local builds are as simple, as they were.
• Windows MinGW version is deleted. Official downloads from Qt do not provide separate binaries for it. We use GCC on Linux (which is mostly the same essentially), so the benefits of using yet another compiler is not worth the effort.

Test Plan

This was tested here: https://github.com/gikari/qnvim/actions/runs/3550716748

Local testing might be necessary:

• [x] Windows
• [x] Linux
• [x] macOS

[sassanh]

Thanks! Sorry for the late response, the diff is all good, the problem is I ran it once on macOS and it failed and I haven't find the time to check it again or investigate the issue, that's why it is taking long. I will check it again as soon as possible.

[gikari]

I've made some changes, so that you don't have to delete the dist* directory every time you want to change the downloaded Qt Creator version. This is useful, when upgrading the plugin to the next version.

Tag Pipeline: https://github.com/gikari/qnvim/actions/runs/3608183214

[sassanh]

OK, it is building on my machine, but it is downloading untracked files in root directory of the project:

On branch feature/unify-qtc-with-ci
Your branch is up to date with 'origin/feature/unify-qtc-with-ci'.

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        qtc_ver=4.15.2
        qtcreator.7z
        qtcreator_dev.7z

nothing added to commit but untracked files present (use "git add" to track)

Can we avoid this? Or add them to .gitignore maybe?

[gikari]

OK, it is building on my machine, but it is downloading untracked files in root directory of the project:

On branch feature/unify-qtc-with-ci
Your branch is up to date with 'origin/feature/unify-qtc-with-ci'.

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        qtc_ver=4.15.2
        qtcreator.7z
        qtcreator_dev.7z

nothing added to commit but untracked files present (use "git add" to track)

Can we avoid this? Or add them to .gitignore maybe?

Hm, this should not happen. They supposed to be downloaded into build directory. I will look into it.

[gikari]

This might fix the problem. Just in case: DownloadQtCreator.cmake should not be imvoked manually on local machine. It is invoked by CMake automatically.

[sassanh]

Thanks! It's all good now.