Fixed culture sensitivity when parsing AspectRatio components

[Sergio0694]

Fixes #4252

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

The AspectRatio.ConvertToAspectRatio(string) method used for parsing is using Convert.ToDouble, which by default uses the current culture for parsing. This causes a crash when trying to parse a number using '.' as decimal separator on cultures that instead use ',' as decimal separator (eg. French, Italian). Furthermore, the parsing behavior is not consistent with eg. the various Vector2/3/4 and Quaternion parsing APIs in the StringExtensions class in Microsoft.Toolkit.Uwp.UI.

What is the new behavior?

Updated the parsing logic in AspectRatio.ConvertToAspectRatio(string) to be consistent with other parsing APIs.
The parsing is now done using CultureInfo.InvariantCulture, which fixes the crash reported in the linked issue.

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• New component
  • Pull Request has been submitted to the documentation repository instructions. Link:
  • Added description of major feature to project description for NuGet package (4000 total character limit, so don't push entire description over that)
  • If control, added to Visual Studio Design project
• Sample in sample app has been added / updated (for bug fixes / features)
  • Icon has been created (if new sample) following the Thumbnail Style Guide and templates
• New major technical changes in the toolkit have or will be added to the Wiki e.g. build changes, source generators, testing infrastructure, sample creation changes, etc...
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Header has been added to all new source files (run build/UpdateHeaders.bat)
• Contains NO breaking changes

[ghost]

Thanks Sergio0694 for opening a Pull Request! The reviewers will test the PR and highlight if there is any conflict or changes required. If the PR is approved we will proceed to merge the pull request 🙌