Android: Replace AVD partition-size spinbox with emulator args input

The android emulator supports many more command-line startup options
than "-partition-size". Let's allow the user to take advantage of the
full functionalty, by providing a free-text input field for the options.

A link to the online documentation is also provided.

As a side-effect, the issue that an overridden parition size can cause
the "Cold Boot: different AVD configuration" warning is solved by not
having -partition-size by default.

Task-number: QTCREATORBUG-24735
Change-Id: I41d7b826133708c7ff447c1e257f62368745dea1
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

src/plugins/android/androidavdmanager.cpp

@@ -278,7 +278,7 @@ bool AndroidAvdManager::startAvdAsync(const QString &avdName) const
     if (AndroidConfigurations::force32bitEmulator())
         arguments << "-force-32bit";
 
-    arguments << "-partition-size" << QString::number(m_config.partitionSize())
+    arguments << m_config.emulatorArgs()
               << "-avd" << avdName;
     qCDebug(avdManagerLog) << "Running command (startAvdAsync):"
                            << CommandLine(m_config.emulatorToolPath(), arguments).toUserOutput();