BrowserSim: use JavaFX WebView as a browser engine

JavaFX WebView supports Debugger API and could be embedded into BrowserSim as an alternative to the SWT Browser.

Pros:

1. WebView supports Debugger API - we can enable full featured DevTools and/or integrate it with EclipseDebugger
2. It is available on all OSes where Oracle JVM 7 is installed - no requirement to install Safari and 32-bit JVM on Windows
3. Can be used together with the SWT Browser (i.e. if there is no JavaFX present, we can fallback to the SWT Browser in runtime)

Cons:

1. Not a part of OpenJDK, Oracle JVM 7 only (not sure if JavaFX could be installed standalone)
2. window.localStorage is not supported (may be a problem for CordovaSim)
3. Character encoding problems on some installations
4. Debugger API bindings to Java are not final now - we can face Java run-time errors with later versions of Oracle JVMs

On the high level our plan is to:

1. Implement possibility of switching BrowserSim's web engine SWT.WEBKIT / JavaFx WebView. This possibility will be enabled only for windows and mac os users. Due to native errors coupled with gtk3 usage (related jira https://javafx-jira.kenai.com/browse/RT-35264 ) there will be only one web engine on Linux - SWT.WEBKIT. - Done

• Disable switcher for Linux platform - Done

1. Solve perfomance issues. Debugger freezes rather often - Done
2. Mock javaFX dependencies - Done
3. Fix LiveReload and Touch Events for JavaFx WebView - Done
4. Remove submodule - Done
5. Port for debugging should not be hardcoded - Done