... instead of deprecated result_of.

[MaL] Curves; Generalize ctor to accept non-rvalue

See merge request ogs/ogs!3408

[BHE] fixed the pipe diameter parameter in the BHE 1U type

See merge request ogs/ogs!3404

[HM] remove Kpu_k

See merge request ogs/ogs!3406

This reverts commit fe60a51b.

Time loop fix when MFront fails.

See merge request ogs/ogs!3397

[MaL] Use old-style target link libs for MKL.

See merge request ogs/ogs!3400

Release branch binary deployment and CI fixes

See merge request ogs/ogs!3401

Allows execution of the containers on envinf1.

This is partially reverting 071c19a9
"[CMake] Use generator expression for target_link_libraries()".

For the ninja build system when using shared libraries the
generator expressions produce erroneous build.ninja file, and
ninja generates an error:

```
CMake Error:
  Running

   '/usr/bin/ninja' '-C' '/home/naumov/w/ogs/r' '-t' 'recompact'

  failed with:

   ninja: error: build.ninja:8128: bad $-escape (literal $ must be written as $$)
```

Reason unknown.

Small fixes and code cleanups.

See merge request ogs/ogs!3399

Bump Qt to 5.14.2 on Win

See merge request ogs/ogs!3398

Fixes CppCheck warnings:
Member variable 'QuadTree < GeoLib :: Point >::_children' is not initialized in the constructor.

Cppcheck issue was:
Consider using std::find_if algorithm instead of a raw loop.

Includes C++20 fix https://bugreports.qt.io/browse/QTBUG-82240

[RM] Two minor improvements.

See merge request ogs/ogs!3394

[ci] Enable ci for release branches in the form v6.x.x.

See merge request ogs/ogs!3396

[ci] Use proper env var for setting the git fetch depth

See merge request ogs/ogs!3395