For both UIWebView and WKWebView implementations on iOS.
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### Platforms affected
iOS
### What does this PR do?
Fixes `beforeload` event (introduced by #276) for iOS
### What testing has been done on this change?
Tested both allow & deny loading of URL with both iOS implementations in [test container app](https://github.com/dpa99c/cordova-plugin-inappbrowser-wkwebview-test) (ignore its README).
- To test with UIWebView use options: `beforeload=yes,usewkwebview=no`
- To test with WKWebView use options: `beforeload=yes,usewkwebview=yes`
### Checklist
- [x] [Reported an issue](http://cordova.apache.org/contribute/issues.html) in the JIRA database
- [x] Commit message follows the format: "CB-3232: (android) Fix bug with resolving file paths", where CB-xxxx is the JIRA ID & "android" is the platform affected.
- [x] Added automated test coverage as appropriate for this change.
closes#349
Added support for hiding the web view container. This maintains the browser
session without closing it. The browser window can be repeatedly hidden and
shown.
** This has only been tested on android and ios **
amazon/android:
An additional `hide` action was added to `InAppBrowser#execute`. It is
identical to `show`, except that it calls `dialog.hide()` instead.
blackberry10:
no changes
firefoxos:
Added a `hide` method that is identical to `show`, indicating it is not
supported.
ios:
Added a `hide` method that is identical to `show`, except that it uses
`dismissViewControllerAnimated`. It checks the value of
`_previousStatusBarStyle`. If it is `-1`, the method returns with no
action performed. If it is not, it is set to `-1.`
ubuntu:
Added a `hide` method that sets `CordovaWrapper.global.inappbrowser.visible` to
`false`.
windows:
Added a `hide` method that sets `browserWrap.style.display` to `none`.
wp:
Added a `hide` method that is identical to `show`, except that it sets
`browser.Visibility` to `Visibility.Collapsed` and sets `AppBar.IsVisible` to
`false`.
The position of the toolbar is now configurable, it can be specified on
the caller's side. The possible values are top and bottom and the key
for the setting is toolbarposition. Also extended the logging of the web
view's load errors, it now logs the error code too, not just the
localized description of the error that occured. Added the
browserOptions to the init method's parameters in order to make it
conveniently accessible from the ViewController.
