magnum-plugins: migrate to Conan v2

[valgur]

Requires

• magnum: migrate to Conan v2 #18860

[conan-center-bot]

Conan v1 pipeline ❌

Failure in build 2 (a4960d0911dd0561cd0acfc03071079d29314624):

• magnum-plugins/2020.06:
  Error running command conan info magnum-plugins/2020.06@#92197c76b7d429e17d7ea9e9b8c9848d --json {jsonName} -pr {profileName}:

  [settings]
  arch=x86_64
  build_type=Release
  compiler=gcc
  compiler.libcxx=libstdc++11
  compiler.version=5
  os=Linux
  [options]
  magnum-plugins:shared=False
  
  ...
  openal/1.21.1: WARN: Recipe 'openal/1.21.1' is deprecated in favor of 'openal-soft'. Please, consider changing your requirements.
  ERROR: Conflict in sdl/2.0.20:
      'sdl/2.0.20' requires 'libalsa/1.2.10' while 'openal/1.21.1' requires 'libalsa/1.2.7.2'.
      To fix this conflict you need to override the package 'libalsa' in your root package.
  

---

^{Note: To save resources, CI tries to finish as soon as an error is found. For this reason you might find that not all the references have been launched or not all the configurations for a given reference. Also, take into account that we cannot guarantee the order of execution as it depends on CI workload and workers availability.}

---

Conan v2 pipeline ❌

Note: Conan v2 builds are now mandatory. Please read our discussion about it.

The v2 pipeline failed. Please, review the errors and note this is required for pull requests to be merged. In case this recipe is still not ported to Conan 2.x, please, ping @conan-io/barbarians on the PR and we will help you.

See details:

Failure in build 2 (a4960d0911dd0561cd0acfc03071079d29314624):

• magnum-plugins/2020.06:
  Error running command conan graph info --requires magnum-plugins/2020.06@#92197c76b7d429e17d7ea9e9b8c9848d -f json -pr:h /home/conan/w/prod-v2/bsr/51033/fbdbf/profile_linux_11_libstdcpp11_17_gcc_release_64.-shared-False.txt -pr:b /home/conan/w/prod-v2/bsr/51033/fbdbf/profile_linux_11_libstdcpp11_17_gcc_release_64..txt:

  ======== Computing dependency graph ========
  magnum/2020.06: Not found in local cache, looking in remotes...
  magnum/2020.06: Checking remote: conan-center
  magnum/2020.06: Downloaded recipe revision 309228b9bff85dd9d6a3d9d46ed36378
  Graph root
      cli
  Requirements
      magnum-plugins/2020.06#92197c76b7d429e17d7ea9e9b8c9848d - Cache
  Graph error
      Package 'magnum/2020.06' not resolved: magnum/2020.06: Cannot load recipe.
  Error loading conanfile at '/home/conan/w/prod-v2/bsr/51033/ecbad/p/magnub849c8e8445df/e/conanfile.py': Unable to load conanfile in /home/conan/w/prod-v2/bsr/51033/ecbad/p/magnub849c8e8445df/e/conanfile.py
    File "<frozen importlib._bootstrap_external>", line 728, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/home/conan/w/prod-v2/bsr/51033/ecbad/p/magnub849c8e8445df/e/conanfile.py", line 1, in <module>
      from conans import ConanFile, CMake, tools
  ImportError: cannot import name 'ConanFile' from 'conans' (/opt/pyenv/versions/3.7.13/lib/python3.7/site-packages/conans/__init__.py)
  .
  *********************************************************
  Recipe 'magnum/2020.06' seems broken.
  It is possible that this recipe is not Conan 2.0 ready
  If the recipe comes from ConanCenter, report it at https://github.com/conan-io/conan-center-index/issues
  If it is your recipe, check if it is updated to 2.0
  *********************************************************
  
  ERROR: Package 'magnum/2020.06' not resolved: magnum/2020.06: Cannot load recipe.
  Error loading conanfile at '/home/conan/w/prod-v2/bsr/51033/ecbad/p/magnub849c8e8445df/e/conanfile.py': Unable to load conanfile in /home/conan/w/prod-v2/bsr/51033/ecbad/p/magnub849c8e8445df/e/conanfile.py
    File "<frozen importlib._bootstrap_external>", line 728, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/home/conan/w/prod-v2/bsr/51033/ecbad/p/magnub849c8e8445df/e/conanfile.py", line 1, in <module>
      from conans import ConanFile, CMake, tools
  ImportError: cannot import name 'ConanFile' from 'conans' (/opt/pyenv/versions/3.7.13/lib/python3.7/site-packages/conans/__init__.py)
  .
  

---

^{Note: To save resources, CI tries to finish as soon as an error is found. For this reason you might find that not all the references have been launched or not all the configurations for a given reference. Also, take into account that we cannot guarantee the order of execution as it depends on CI workload and workers availability.}