added iced tour example template

templates/apps/iced/.gitignore.hbs

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+# Rust
+target/
+**/*.rs.bk
+
+# cargo-mobile
+.cargo/
+/gen
+
+# macOS
+.DS_Store

templates/apps/iced/Cargo.toml.hbs

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+[package]
+name = "{{app.name}}"
+version = "0.1.0"
+authors = ["{{author}}"]
+edition = "2018"
+
+[package.metadata.cargo-apple.ios]
+frameworks = ["CoreText"]
+
+[lib]
+crate-type = ["staticlib", "cdylib", "rlib"]
+
+[[bin]]
+name = "{{app.name}}-desktop"
+path = "gen/bin/desktop.rs"
+
+[dependencies]
+mobile-entry-point = "0.1.1"
+iced = { git = "https://github.com/discordance/iced.git", branch = "ios_fixes", features = ["image", "debug"] }
+
+[target.'cfg(target_os = "android")'.dependencies]
+android_logger = "0.9.0"
+log = "0.4.11"
+ndk-glue = "0.2.1"
+
+[target.'cfg(not(target_os = "android"))'.dependencies]
+simple_logger = "1.11.0"
+

templates/apps/iced/README.md

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+# iced
+
+This is just the [`iced` tour example](https://github.com/hecrj/iced/tree/master/examples/tour) with very light modifications:
+
+- The `#[mobile_entry_point]` annotation generates all the boilerplate `extern` functions for mobile.
+- Logging on Android is done using `android_logger`.
+
+there is an issue with metal validation 
+https://github.com/gfx-rs/wgpu/issues/185
+which is a problem also referenced in 
+https://github.com/gfx-rs/wgpu/issues/185
+
+Until this is fixed in either iced or wgpu, metal validation needs to be deactivated, otherwise app panics.
+
+To do so in Xcode:
+Product > Scheme > Edit scheme > Run > Metal validation => disabled
+
+To run this on desktop, just do `cargo run` like normal! For mobile, use `cargo android run` and `cargo apple run` respectively (or use `cargo android open` and `cargo apple open` to open in Android Studio and Xcode respectively).

templates/apps/iced/gen/bin/desktop.rs.hbs

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+fn main() {
+    #[cfg(not(any(target_os = "android", target_os = "ios")))]
+    {{snake-case app.name}}::start_app();
+}