Add correct IDisposable implementation

Improvement #36 (closed)

Once an item has been disposed and freed on the native side, if the user keeps a reference on that object and perform calls (with a NativeReference equals to IntPtr.Zero), it will cause an AccessViolationException.

Granted the user should not do that, but our code should not crash either. Should we perform a NativeReference check before each libvlc call to avoid this exception when users perform calls on disposed instances? And output to log if this happens.

cc @jeremyVignelles

We should probably make checks and throw new ObjectDisposedException(); but low priority for me.

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• 3d18fb32 - Add RendererDiscoverer IDisposable implementation

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• 83ab3572 - Add RendererDiscoverer IDisposable implementation

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mentioned in commit 9b304411

merged