A small step for #446🕸️ Web support, use web-sys to interface to the web.
Previously, we would try to use glutin on the web, which is not supported;
now glutin is only used on native: fixes#171 could not find Context in platform_impl.
winit is still used on both, but the GL context is created with web-sys and glow
(on the web), and created with glutin and used with glow (on native). stdweb is
no longer used, being replaced by web-sys.
Substantial refactoring to allow reusing the code between web/native:
* settings: use VirtualKeyCode from winit, not reexported from glutin
* std_or_web: remove broken localstoragefs/stdweb, add File placeholder
* render: disable skin_thread on wasm since we don't have threads
* gl: use glow types in gl wrapper (integers in native, but Web*Key in web)
* gl: web-sys WebGlUniformLocation does not implement Copy trait, so glow::UniformLocation doesn't so gl::Uniform can't
* gl: refactor context initialization, pass glow::Context to gl::init for consistency between native/web
* gl: update to glow with panicking tex_image_2d_multisample web-sys wrapper
* glsl: use shader version in GLSL for WebGL 2 and OpenGL 3.2
* shaders: add explicit float/int type conversions, required for WebGL
* shaders: specify mediump precision, required for WebGL
* shaders: specify fragment shader output locations for WebGL
* main: refactor handle_window_event to take a winit window, not glutin context
* main: handle resize outside of handle_window_event since it updates the glutin window (the only event which does this)
* main: use winit events in handle_window_event not reexported glutin events
* main: refactor game loop handling into tick_all()
* main: create winit window for WebGL, and use winit_window from glutin
* main: restore console_error_panic_hook, mistakingly removed in (#260)
* main: remove force setting env RUST_BACKTRACE=1, no longer can set env on web
* www: index.js: fix wasm import path
* www: npm update, npm audit fix
* www: update readme to link to status on #446🕸️ Web support
Bump cfg-if to 1.0.0 (closes#412)
Bump serde to 1.0.117 (closes#416)
Bump serde_json to 1.0.59 (closes#413)
Bump structopt to 0.3.20 (closes#414)
Bump flate2 to 1.0.19 (closes#420)
Bump reqwest to 0.10.9 (closes#423)
* Closes#237 Bump base64 from 0.10.1 to 0.11.0
* Closes#241 Bump flate2 from 1.0.12 to 1.0.13
* Closes#245 Bump num-traits from 0.2.8 to 0.2.10
* Closes#248 Bump serde_json from 1.0.41 to 1.0.44
* Closes#249 Bump serde from 1.0.102 to 1.0.104
* Closes#251 Bump web-sys from 0.3.30 to 0.3.33
* Closes#254 Bump structopt from 0.3.3 to 0.3.7
* Bump cfg-if from 0.1.9 to 0.1.10
* `cargo update` all modules
ice_iix