QML - show: item.valid not working after including Venus OS v3.00~14

[mr-manuel]

Describe the bug
All items in the QML file that are validated to show or not are displayed indipendent of the result.

To Reproduce
Steps to reproduce the behavior:
Update to the latest v3.00 Venus OS firmware.

Expected behavior
Not valid items should not be shown.

Screenshots

VenusOS (please complete the following information):

• Device type: [e.g. VenusGX, Cerbo, Raspberry Pi]
• Firmware Version: >= v3.00~14

Additional context

MbRowSmall, MbTextBlock and Text objects do not support the 'show' parameter. These objects did support show prior to v3.00~14.
The 'show' parameter for objects inside a VisualItemModel do not hide the item in v3.00~14 as they did in previous Venus OS versions. This is a known issue, just making readers aware.
https://community.victronenergy.com/questions/179527/bug-hiding-gui-objects-not-working.html?childToView=180447#answer-180447

VisibleItemModel will not work prior v3.00~14 and will result in a blank GUI.

@kwindrem solved it that way:
https://github.com/kwindrem/SetupHelper/blob/87274c481fc0e5b61f259ee2e0bd9b07d4dec4f6/setup#L91-L105

https://github.com/kwindrem/SetupHelper/blob/ebaa65fcf23e2bea6797f99c1c41174143c1153c/updateFileSets#L56-L81

head -n 1 /opt/victronenergy/version

I will open a pull request later.

[mr-manuel]

Commited to open pull request.