Consider changing "Close" panel button to be "Hide"

[Tyriar]

Currently all panels feature a x button which when hovered say "Close". This is ambiguous for the terminal as to weather it will destroy the processes and potentially will be for other/future panels. I suggest changing this to a minimize/hide icon - with a tooltip that reads "Hide".

/cc @bgashler1 @bpasero @stevencl

[dbaeumer]

Assigning to @bgashler1 since this is a overall UI issue

[bgashler1]

After discussing this with others and thinking about it, I feel it's best we use a downward chevron arrow (collapse arrow).

This implies a non-destructive removal of a view and disambiguates the expected behavior some users have of an "X" in a terminal (terminating a process, removing history and closing the terminal).

[Tyriar]

I'll leave the "Close" tooltip as is to keep it consistent with the command name