fix issue #820: handled the error risen when trying to connect to the… (#821)

* fix issue #820: handled the error risen when trying to connect to the LNA board and commented out all the code trying to get data from the board. Now the
LNA bias parameters are zeros. Also get rid of the old K band derotator.

* SRT5GHzReceiver with CLOW LO

* SRT5GHz test configuration patched

* fix issue #820: handled (got rid) of an error coused by the lan control board replacement that could affect the setup process of the receiver

* Update .gitignore

.vscode extension

* Fix #820, upd. ReceiversLibrary and K band component

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Co-authored-by: Andrea Orlati <a.orati@ira.inaf.it>
Co-authored-by: Giuseppe Carboni <giuseppecarboni89@live.com>
Co-authored-by: Sergio Poppi <s.poppi@gmail.com>

I will merge this now, if anything wrong may arise in the future, we will fix it