doc: mention EmscriptenApplication everywhere.

doc/building.dox

@@ -526,6 +526,9 @@ going to build any of the @ref example-index "examples", you'll need it.
     @ref Platform::AndroidApplication "AndroidApplication" library. Available
     only on @ref CORRADE_TARGET_ANDROID "Android". Enables also building of the
     GL library.
+-   `WITH_EMSCRIPTENAPPLICATION` --- Build the
+    @ref Platform::EmscriptenApplication "EmscriptenApplication" library.
+    Available only on @ref CORRADE_TARGET_EMSCRIPTEN "Emscripten".
 -   `WITH_GLFWAPPLICATION` --- Build the
     @ref Platform::GlfwApplication "GlfwApplication" library. Depends on
     [GLFW](http://glfw.org).

doc/changelog.dox

@@ -151,6 +151,10 @@ See also:
 
 @subsubsection changelog-latest-new-platform Platform libraries
 
+-   Added @ref Platform::EmscriptenApplication, implementing a lightweight and
+    more flexible alternative to @ref Platform::Sdl2Application for Emscripten.
+    This is now the recommended application to use for WebGL builds. See
+    [mosra/magnum#300](https://github.com/mosra/magnum/pull/300).
 -   @ref Platform::Sdl2Application and @ref Platform::GlfwApplication are now
     DPI-aware on Windows as well. See their documentation,
     @ref platforms-windows-hidpi and [mosra/magnum#243](https://github.com/mosra/magnum/issues/243)

doc/cmake.dox

@@ -122,6 +122,8 @@ the components. The optional components are:
 
 Platform namespace is split into more components:
 
+-   `AndroidApplication` --- @ref Platform::AndroidApplication "AndroidApplication"
+-   `EmscriptenApplication` --- @ref Platform::EmscriptenApplication "EmscriptenApplication"
 -   `GlfwApplication` --- @ref Platform::GlfwApplication "GlfwApplication"
 -   `GlxApplication` --- @ref Platform::GlxApplication "GlxApplication"
 -   `Sdl2Application` --- @ref Platform::Sdl2Application "Sdl2Application"

doc/credits.dox

@@ -121,10 +121,11 @@ Are the below lists missing your name or something's wrong?
     improvements to @cb{.cmake} android_create_apk() @ce
 -   **Ivan P.** ([\@uzername](https://github.com/uzername)) --- documentation
     improvements
--   **Jonathan Hale** ([\@Squareys](https://github.com/Squareys)) --- @ref Audio
+-   **Jonathan Hale** ([\@Squareys](https://github.com/Squareys)) ---
-    library enhancements, @ref Platform::GlfwApplication implementation,
+    @ref Audio library enhancements, @ref Platform::GlfwApplication and
-    frustum and cone culling, bug reports, Windows build improvements,
+    @ref Platform::EmscriptenApplication implementation, frustum and cone
-    documentation improvements and tons of other stuff
+    culling, bug reports, Windows build improvements, documentation
+    improvements and tons of other stuff
 -   **Joel Clay** ([\@jclay](https://github.com/jclay)) --- Vcpkg packages
 -   **Konstantinos Chatzilygeroudis** ([\@costashatz](https://github.com/costashatz))
     --- Debian package