SharpKOM Files

New features:
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* Show servername in titlebars in floating windows
* Show the number of waiting requests in the tooltip on the progressbar
* Only show each exception once per program session (avoids endless loops with identical error messages)
* Show unread instant messages on the disconnected screen. This allows viewing of messages explaining scheduled shutdowns of the lyskom server.
* Configurable sounds alerts
* Update presentation subject to match user name when presentation text is changed
* Mouse back and forward buttons navigate text history back and forward

Bug fixes:
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* Crash when jumping between classic and swoosh view and then writing a text.
* Floating windows navigated the wrong servertab
* Crash if closing the SearchTexts window while the find results are loading

Improvements:
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* Refactor: Change the lookup of whether myself and/or the author is member of at least some of the recipients to asynchronous to avoid blocking the complete UI if the lookup takes a while.
* Show subject on the same line as "Subject: " when copy whole text
* Idle-prefetch first text immediately, don't wait gracefully for the first unread, only for the rest.
* More graceful socket handling, including immediate disconnect if server closes the connection.

Performance:
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* Minor reduction of temporary lists in some Enumerators
* Cancel fetching more texts when the find window is closed