Platform detection

[CodingWonders]

Type of Change

• Bug fix

Description

This PR adds platform detection to avoid running scripts on non-macOS systems:

• It uses native .NET properties to check if the OS platform is Unix
• It then checks if osascript exists

It also fixes gitignore if changes were to be made in Visual Studio (something I'll most probably use when making changes to MacUtil).

Testing

Testing has worked correctly on both Windows and macOS. On Linux (WSLg) it would only display the window border.

Issues / other PRs related

None

Additional Information

It is recommmended that it be tested on Linux, but it should work fine.

Checklist

• My code adheres to the coding and style guidelines of the project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no errors/warnings/merge conflicts.