Ribbon button bar can now optionally show tooltips for disabled items as well

[wxBen]

By default the ribbon bar does not show tooltips for disabled buttons. However, many applications like Excel show tooltips for disabled items, because the user may want to know what the item is supposed to do, and sometimes the user may want to use a button and want to know why it is disabled and they cannot use it.

The code change adds a boolean flag to optionally turn on tooltips for disabled buttons.

The ribbonbar demo does not demonstrate this, because it is a fairly small nitpicky minor detailed non mainstream feature.

[wxBen]

ToolTipForDisabled.diff

[VZ]

(In [72950]) Optionally allow showing tooltips for disabled ribbon buttons.

Add wxRibbonButtonBar::SetShowToolTipsForDisabled() to allow enabling the
tooltips even for the disabled buttons.

Closes #14820.