Fix #560 - Refactor HVACSystems view to hide unavailable controls, allow zooming display on VRF + Refrigeration tab

[jmarrec]

• Fix HVAC tab for VRF does not zoom #560

• Allow zooming the display on the VRF and on the Refrigeration tabs

  • Zoom is reset when you switch to/from the system list view from/to the detailed view

• Replace the buttons to expand a system / move back up to the systems list view (+ tooltip)

• Hide the "Control" and "Grid" buttons when they aren't available.

  • When you were on it and switch to a system type (VRF / SHW, Refrigeration) for which it isn't available, you see the tab that says it's not available, the button is there to make it clear you're on it. As soon as you switch to a valid tab, it disappears.

Here is a GIF showing the new UI:

Allow zooming with CTRL + WheelUp/Down or CTRL + '+' / '-'

[jmarrec]

I'm going to merge this, we can refactor the logic in a second PR.