This also fixes an issue where MIDI CI header data could contain spaces,
which is not allowed according to the spec.

This fixes a bug where moving a window between displays with different
scaling settings makes the embedded WebView misaligned.

While improving Android IME support (da38c1ed), text editor destructors
were updated to explicitly pass keyboard focus elsewhere.
As far as I remember, the change was intended to prevent the text input
system from trying to send input events to components while they were
being destroyed, in which case the TextInputTarget and Component bases
may be 'valid', but the data members referenced by the TextInputTarget
implementation may have been destroyed.

The motivation for removing these lines is that giving away focus and
sending a focus event can cause all components to become unfocused. This
is problematic in the case of slider text editors - pressing 'enter'
will cause the TextEditor to be destroyed, but the parent component will
fail to gain focus, so pressing 'tab' will not have any effect.

In order to display a WebKit based webview a plugin will deploy a
temporary standalone executable on the system and host the WebKit
instance inside that.

Until this commit it was possible that the message thread got stuck
waiting for the WebBrowserComponent's thread to finish, while the thread
was waiting for the message thread to handle a posted message.