epaint_default_fonts 0.35.0 - bundled font license provenance

Declared license (Cargo.toml): (MIT OR Apache-2.0) AND OFL-1.1 AND Ubuntu-font-1.0

This crate bundles font binaries, so the license is a conjunction, not a
choice. The declared string covers the crate as a whole; the per-font notices
shipped upstream are the authoritative mapping, and they do NOT line up with
the declared string one-to-one. In particular Hack is MIT plus Bitstream Vera,
not OFL, so the declared "OFL-1.1" applies to NotoEmoji only.

Bundled font files and their licenses (taken from the upstream notices, not
from the declared string):
  1. Hack-Regular.ttf        -> MIT, Copyright 2018 Source Foundry Authors.
                                Derived from DejaVu (public domain) and
                                Bitstream Vera Sans Mono, Copyright 2003
                                Bitstream, Inc., under the Bitstream Vera
                                License with Reserved Font Names "Bitstream"
                                and "Vera". All three notices are in
                                epaint-default-fonts.Hack.txt.
  2. NotoEmoji-Regular.ttf   -> OFL-1.1 (SIL Open Font License 1.1)
  3. Ubuntu-Light.ttf        -> Ubuntu-font-1.0 (Ubuntu Font Licence 1.0)
  4. emoji-icon-font.ttf     -> MIT, Copyright (c) 2014 John Slegers

Files in this directory and their upstream origin (all copied verbatim from
the epaint_default_fonts-0.35.0 crate, fonts/ directory; sha256 recorded in
the viewer material manifest):
  epaint-default-fonts.Hack.txt                    <- fonts/Hack-Regular.txt
  epaint-default-fonts.OFL-1.1.txt                 <- fonts/OFL.txt
  epaint-default-fonts.Ubuntu-font-1.0.txt         <- fonts/UFL.txt
  epaint-default-fonts.emoji-icon-font.MIT.txt     <- fonts/emoji-icon-font-mit-license.txt

Do not substitute a generic SIL template for fonts/OFL.txt. A blank template
carries unfilled <Copyright Holder> and <Reserved Font Name> placeholders, so
it names no copyright holder and does not satisfy the notice requirement; the
upstream file is the text that actually accompanies the font.

Note on redistribution: OFL-1.1 and Ubuntu-font-1.0 both require the license
text to accompany the fonts, and the MIT and Bitstream Vera notices for Hack
require the copyright notice to travel with copies. These fonts are embedded
in the surver/wasm artifacts, so all four texts above MUST ship with any
distribution that contains those artifacts. The MIT/Apache texts under
licenses/epaint_default_fonts-0.35.0/upstream/ cover the crate code itself but
do NOT cover the font binaries.
