hard stop blinking rec-arm
increase fixed button sizes on meterbridge
fix alert box: identical layout as transport option buttons
further button size polish
no more button text position rounding

For all non-grouped buttons, size request takes
care of assigning a proper geometry.
never change button element name.

changing the name overrides font style.
set proper name (font) for number labels
fundamentally change ArdourButton PangoLayout handling

This fixes issues where button text was set during static
initialization where the widget style was not yet available,
and a lot of related issues where the text was set
before style.
fix lock button font size

(ArdourButton no longer supports font size via markup)
remove cruft