BaseClass:OPen Associated GUI FP: If there is no GUI running, the proxy of this device will try to create one

- Polling.vi: Added a maximum rate at which the BeAlive Msg can be sent to a watchdog actor when used inside the polling mechanism
- Watchdog: (i) Modified InitAttributes so that it is possible to run the class without the URL sections + (ii) added two new Reborn messages which can be sent to the callee actor when an observed actor recovers from a timeout

Added a new message to the BaseActor: "Open Associated GUI FP" which tries to open a FP for the associated GUI

Modified the Shutdown variable again (before it was GuiWorkerCoupling now it is GuiShutdownBehaviour). It has now a third option "hide", which just hides the FP (but one has to be careful here that someone stops the actor!).

Added a small feature which makes it possible to calculate URLs (this is very helpful for large power supplies)

- Corrected a bug in the Send Msg by Name which prevented it to work with other executables on the same node

Send info to message logger if polling interval is less than minimum polling interval. This closes #14.

Close #17

Close issue15.

Use TARGET_TYPE for Conditional disable to distinguish between Windows/Unix and embedded targets where no Menu-Ref ist is allowed.