Simplify the FontIDAllocator a lot (#2827).

This is at the expense of forward compatibility, and the need to
re-examine subtitle content (losing custom fonts as we do so).

But it does mean that the code is simpler, and there's not this weird
growth of IDs where a DCP gets imported with some font, and then the ID
becomes 0_font, and if you do it again it's 0_0_font, and so on.

1 files changed, 0 insertions, 0 deletions

diff --git a/test/data b/test/data
-Subproject 722dd8023aa1f4657328aa228ea146679cf7fab
+Subproject 7a5254c53354ea8aaa5c60ae44965e510dd9651