Revert change to winit event loop in egui_glium (#756)

* Revert change to winit event loop in egui_glium

This reverts #631

Fixes #755

* Add example of file dialogs and file drag-and-drop

* fix ci

.github/workflows/rust.yml

@@ -82,7 +82,7 @@ jobs:
           profile: minimal
           toolchain: 1.54.0
           override: true
-      - run: sudo apt-get install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libspeechd-dev libxkbcommon-dev libssl-dev
+      - run: sudo apt-get install libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libspeechd-dev libxkbcommon-dev libssl-dev libgtk-3-dev # libgtk-3-dev is used by rfd
       - uses: actions-rs/cargo@v1
         with:
           command: test
@@ -115,7 +115,7 @@ jobs:
           toolchain: 1.54.0
           override: true
       - run: rustup component add clippy
-      - run: sudo apt-get install libspeechd-dev
+      - run: sudo apt-get install libspeechd-dev libgtk-3-dev # libgtk-3-dev is used by rfd
       - uses: actions-rs/cargo@v1
         with:
           command: clippy

eframe/CHANGELOG.md

@@ -1,6 +1,8 @@
 # Changelog for eframe
 All notable changes to the `eframe` and `epi` crates.
 
+NOTE: [`egui_web`](egui_web/CHANGELOG.md), [`egui-winit`](egui-winit/CHANGELOG.md) and [`egui_glium`](egui_glium/CHANGELOG.md) have their own changelogs!
+
 
 ## Unreleased
 * `Frame` now provides `set_decorations` to set whether to show window decorations.

eframe/Cargo.toml

@@ -36,6 +36,7 @@ egui_web = { version = "0.14.0", path = "../egui_web", default-features = false
 
 [dev-dependencies]
 image = { version = "0.23", default-features = false, features = ["png"] }
+rfd = "0.5.0"
 
 [features]
 default = ["default_fonts"]