VLCLibrary::debugLogging

1. Return value of VLCLibrary::debugLogging is always false.
2. VLCLibrary::debugLoggingLevel can be set to int outside of the preset range; 0-4.

guard let library = VLCLibrary.shared() else {
    XCTFail("Could not retrieve shared library")
    return
}

library.debugLogging = true
library.debugLoggingLevel = 9000

// Always fails
XCTAssertTrue(library.debugLogging)

// debugLoggingLevel should range from 0-4.
XCTAssertEquals(library.debugLoggingLevel, 9000)