Add option "system has normal AC loads"; allowing installer to set that to No. about venus HOT 3 OPEN

@izak pls let me know what you think of above approach; required effort in systemcalc; and make sure to do a quick test (!). Ie set those loads to 0 hardcoded in systemcalc, and see if my assumption that that is already an improvement is true.

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I think we need to integrate this with the existing setting, /Settings/SystemSetup/HasAcOutSystem. This already hides AC-out for systems that only has loads on the input side. Perhaps this needs to be an option list where you can choose between the three options: Only input side, only output side, or both.

A crude "make it zero if it isn't invalid" proof of concept reveals:

Before:

After:

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Additionally, an experiment where instead of setting the consumption to zero, it is set to invalid:

GUI v1:

VRM:

from venus.