Connection status issue #2519

[pgScorpio]

In the first stage I just renamed some functions in CClient to make the problem clear.
The second stage should already solve this issue.

Short description of changes

First Stage: Make the cause of the problem clear.

Second Stage:
Moved Connect/Disconnect code from CClientdlg to CClient.
Now using the proper connected checks in several places.
Added bDisconnectAndDisable to CChannel. (For a Client now
Channel.Disconnect() will block audio data and auto disable the channel on disconnected)

CHANGELOG:
Fix for issue #2519

Context: Fixes an issue?

fixes issue #2519

Does this change need documentation? What needs to be documented and how?

No documentation changes.

Status of this Pull Request

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Checklist

• [x ] I've verified that this Pull Request follows the general code principles
• [x ] I tested my code and it does what I want
• [x ] My code follows the style guide
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