Break out mod paint into new crate epaint

epaint/Cargo.toml

@@ -0,0 +1,41 @@
+[package]
+name = "epaint"
+version = "0.7.0"
+authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
+description = "Minimal 2D graphics library for GUI work"
+edition = "2018"
+homepage = "https://github.com/emilk/egui"
+license = "MIT OR Apache-2.0"
+readme = "README.md"
+repository = "https://github.com/emilk/egui"
+categories = ["gui", "graphics"]
+keywords = ["gui", "graphics"]
+include = [
+  "**/*.rs",
+  "Cargo.toml",
+  "fonts/*.ttf",
+]
+
+[lib]
+
+[dependencies]
+emath = { path = "../emath" }
+
+ahash = { version = "0.6", features = ["std"], default-features = false }
+atomic_refcell = { version = "0.1", optional = true } # Used instead of parking_lot when you are always using epaint in a single thread. About as fast as parking_lot. Panics on multi-threaded use.
+parking_lot = { version = "0.11", optional = true } # Using parking_lot over std::sync::Mutex gives 50% speedups in some real-world scenarios.
+rusttype = "0.9"
+serde = { version = "1", features = ["derive"], optional = true }
+
+[features]
+default = ["multi_threaded", "default_fonts"]
+persistence = ["serde", "emath/serde"]
+
+# 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 = []
+
+single_threaded = ["atomic_refcell"]
+
+# Only needed if you plan to use the same fonts from multiple threads.
+multi_threaded = ["parking_lot"]