Move default fonts to new crate epaint_default_fonts (#4853)

This allows license checking tools to omit the OFL and UFL licenses when
`default_fonts` are turned off.

There was some discussion of versioning on the original issue; I have
chosen to label this version as `0.28.1` to match the other crates.
Happy to adjust the version as needed.

<!--
Please read the "Making a PR" section of
[`CONTRIBUTING.md`](https://github.com/emilk/egui/blob/master/CONTRIBUTING.md)
before opening a Pull Request!

* Keep your PR:s small and focused.
* The PR title is what ends up in the changelog, so make it descriptive!
* If applicable, add a screenshot or gif.
* If it is a non-trivial addition, consider adding a demo for it to
`egui_demo_lib`, or a new example.
* Do NOT open PR:s from your `master` branch, as that makes it hard for
maintainers to test and add commits to your PR.
* Remember to run `cargo fmt` and `cargo clippy`.
* Open the PR as a draft until you have self-reviewed it and run
`./scripts/check.sh`.
* When you have addressed a PR comment, mark it as resolved.

Please be patient! I will review your PR, but my time is limited!
-->

* Closes <https://github.com/emilk/egui/issues/2321>
* [X] I have followed the instructions in the PR template

---------

Co-authored-by: Alex Pinkus <pinkus@amazon.com>

crates/epaint/Cargo.toml

@@ -6,7 +6,7 @@ description = "Minimal 2D graphics library for GUI work"
 edition.workspace = true
 rust-version.workspace = true
 homepage = "https://github.com/emilk/egui/tree/master/crates/epaint"
-license = "(MIT OR Apache-2.0) AND OFL-1.1 AND LicenseRef-UFL-1.0" # OFL and UFL used by default_fonts. See https://github.com/emilk/egui/issues/2321
+license = "MIT OR Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/emilk/egui/tree/master/crates/epaint"
 categories = ["graphics", "gui"]
@@ -15,11 +15,7 @@ include = [
   "../LICENSE-APACHE",
   "../LICENSE-MIT",
   "**/*.rs",
-  "Cargo.toml",
-  "fonts/*.ttf",
-  "fonts/*.txt",
-  "fonts/OFL.txt",
-  "fonts/UFL.txt",
+  "Cargo.toml"
 ]
 
 [lints]
@@ -50,7 +46,7 @@ deadlock_detection = ["dep:backtrace"]
 
 ## If set, epaint will use `include_bytes!` to bundle some fonts.
 ## If you plan on specifying your own fonts you may disable this feature.
-default_fonts = []
+default_fonts = ["epaint_default_fonts"]
 
 ## Turn on the `log` feature, that makes egui log some errors using the [`log`](https://docs.rs/log) crate.
 log = ["dep:log"]
@@ -96,6 +92,8 @@ rayon = { version = "1.7", optional = true }
 ## Allow serialization using [`serde`](https://docs.rs/serde) .
 serde = { workspace = true, optional = true, features = ["derive", "rc"] }
 
+epaint_default_fonts = { workspace = true, optional = true }
+
 # native:
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 backtrace = { workspace = true, optional = true }