Android: Add documentation for including third-party libs

Since Qt 5.3.1, androiddeployqt will support deploying third-party
libraries in a relatively simple way. This needs to be documented,
though, since it will probably not be entirely intuitive.

Change-Id: I5ea5127b93f69d9d445cb6d29f330c8e8e895164
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
Doc: Edited list of examples in "Qt for Android Examples" page.

-more functional with regards to a developer progression.
-added link to "Creating a Mobile Application" page.

Change-Id: I8a1b5261df96459592ae253f6a19b57909c51173
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Doc: Added "Qt Examples for iOS" page.

-lists examples that are specifically known to work on iOS
 (based from the list in qtbase/doc/global/manifest-meta.xml)
-focused on Qt Creator and Qt Quick examples.
-excluded Qt Widgets examples from the list
-added links to this new page.

Change-Id: I9d9d775dafd6c6573e2c45ea75756f189e4d07d4
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Doc: Updated "Layout Examples" page.

-added link from "Qt Examples and Tutorials"
-edited paragraphs and links

Task-number: QTBUG-33597
Change-Id: I06ed1234e16be523bb70a13960e1e5a609882a2e
Reviewed-by: Martin Smith <martin.smith@digia.com>
Doc: Edited section about loading QML files.

-focus should be on Qt Creator, not qmlscene.

Change-Id: Iea2c958aaa3457f5040c77c5e2cc1a8367ff82dc
Reviewed-by: Martin Smith <martin.smith@digia.com>