0003252: various smaller reworkings. (1 Viewer)

[MediaPortal-Bot]

* rtspstreaming null pointer check fixed
* tvcardcontext class reworked with LinQ (added unittest)
* new interfaces added: IUser, ITvCardContext
* interface changes done to setupTV and tvplugin as well.
* a few enum classes moved to files.
* all tvengine projects moved from net 2.0 to 3.5

http://mantis.team-mediaportal.com/view.php?id=3252

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