Custom UCs; add text rendering in the IDE
Remove "Log program messages" preference (and associated code)

This old option has been superseded by pdDebug
Custom UCs: improve external font handling

Rather than setting specific font properties in MakeFormPretty, that
function will simply invoke the new updateAgainstCurrentTheme() function
in select UCs, and they will handle their own font recreation and
rendering.
User preferences: new preference for "Interface Decorations"

PD automatically adds various frills to the interface (e.g. drop shadows
on the main viewport and image tabstrip).  A new performance setting
allows the user to toggle these elements, which may improve performance
on low-end PCs.

(Related: some old preferences, like "render canvas drop shadow", have
been removed in favor of this new, central setting.)