Use explicit epaint over paint alias (re-export)

egui reexports the `epaint` crate both under its original name
and under the alias `paint` (for historical reasons)

egui_glium/src/painter.rs

@@ -1,7 +1,10 @@
 #![allow(deprecated)] // legacy implement_vertex macro
 
 use {
-    egui::{emath::clamp, paint::Mesh, Color32, Rect},
+    egui::{
+        emath::{clamp, Rect},
+        epaint::{Color32, Mesh},
+    },
     glium::{
         implement_vertex,
         index::PrimitiveType,