[Feature Request] [v1.4.8-alpha] Add Screenshot Capture Functionality to GUI

[m50S79sM6SRNp8Jn]

Problem Description
Currently, there's no way to capture snapshots from within the GUI. This feature would be useful for diagnostic purposes, documenting issues, or capturing frames for various needs without relying on external tools. Having a built-in method to take screenshots directly from the GUI would improve user experience.

Proposed Solution
Add a "Take Screenshot" button within the GUI that allows users to capture and download a snapshot of the current video stream. The screenshot should be saved in a standard image format (e.g., JPG or PNG). This would make it easy for users to capture a frame without leaving the interface or using third-party software.

Alternatives Considered

• Manually capturing screenshots using the operating system’s native tools, but this method is less efficient, especially when needing to capture specific frames.
• Implementing a command-line solution, but this is less convenient for users who prefer to operate entirely through the GUI.

Additional Context
This feature could greatly enhance the usability of the interface, especially for users needing to report issues or document specific video stream states without leaving the GUI.

[m50S79sM6SRNp8Jn]

This applies to BliKVM v1-4.