This fixes a bug, where VoiceOver would interact with the InnerNSView in
the AudioPluginHost. Instead the focus now jumps from the minimise
button directly to the plugin's first accessible element.

On MacOS the rule is: when returning accessibilityChildren an ignored
child must be replaced with its own children. When returning the
accessibilityParent, an ignored element must be replaced with its own
parent.

This makes it consistent between Windows and MacOS. This is restoring
the behaviour prior to 7e404118b5.

Co-authored-by: Tobias Hienzsch <post@tobias-hienzsch.de>

The accessibilityValue method of the AccessibilityCheckBox and
AccessibilityRadioButton protocols is required to return a
boolean valued NSNumber.

This allows defining JUCE_LOG_CURRENT_ASSERTION when using Visual
Studio, where escaping semicolons in the command-line is not possible.

This patch should resolve an issue introduced in
0ab30555fc where arrow keys and other
directional keys (home, end, page up, page down) stopped working as
expected.

With this patch in place,
- IME input in plugins should work correctly, including for languages
  with a selection palette (Japanese) and languages where multiple
  keypresses combine to a single character (Korean).
- Keyboard shortcuts should work (cut, copy, paste)
- Directional keys should work