Doc: use cross-linking to Qt module documentation

Replace links to "\l{http://qt-project.org/doc/"
with links to topic titles. Remove links where QDoc
creates them automatically based on the .index files.
Add the .index files for the modules that are discussed
in the Qt Creator Manual.

Note: the links will only be generated if the Qt used to
build the docs contains the linked modules and documentation
(.index file) has been generated for them.

Change-Id: Ibe624bf3773e7c854c03ebba4db406be0b4a7b90
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

doc/src/android/androiddev.qdoc

@@ -142,8 +142,7 @@
     SDK to get the API and tools packages needed for development. In addition,
     you must install Qt for Android as part of Qt 5.2, or later.
 
-    For more information, see
-    \l{http://qt-project.org/doc/qt-5/android-support.html}{Qt for Android}.
+    For more information, see \l{Qt for Android}.
 
     To configure connections between \QC and Android devices:
 

doc/src/android/creator-android-app-tutorial.qdoc

@@ -155,7 +155,7 @@
             import QtSensors 5.0
             \endcode
 
-        \li Add the Accelerometer type with the necessary properties:
+        \li Add the \l{Accelerometer} type with the necessary properties:
 
             \quotefromfile accelbubble/main.qml
             \skipto Accelerometer

doc/src/android/deploying-android.qdoc

@@ -154,8 +154,7 @@
     For more information, see \l{Selecting Android Devices}.
 
     For more information about the \c androiddeployqt tool, see
-    \l{http://qt-project.org/doc/qt-5/deployment-android.html}
-    {Deploying an Application on Android}.
+    \l{Deploying an Application on Android}.
 
     \section2 Specifying Settings for Qt 5 Packages
 
@@ -168,8 +167,7 @@
     The anddroiddeployqt tool uses the information in the project .pro file to
     create APKs. For more information about the qmake variables
     that you can set in the .pro file to tailor the APK, see
-     \l{http://qt-project.org/doc/qt-5/deployment-android.html#qmake-variables}
-    {qmake Variables}.
+     \l{Deploying an Application on Android#qmake-variables}{qmake Variables}.
 
     You can view information about what the anddroiddeployqt tool is doing in
     the \gui {Compile Output} pane. To view additional information, select the