ProjectExplorer: Introduce Runnable and Connection concepts.

A 'Runnable' contains (possibly target-specific) data to describe
something that could be run (e.g. a remote executable with
arguments, working directory and environment). A 'Connection'
contains (possibly target-specific) data to describe a connection
to target that will be used to run a Runnable.

Runnable and Connection objects are used in the target
RunControlFactories and are opaque to the project explorer.

Change-Id: I2293dffa71148646cfb52c9b582ccd2675b145a8
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/projectexplorer/runconfiguration.cpp

@@ -541,6 +541,16 @@ Core::Id RunControl::runMode() const
     return m_runMode;
 }
 
+void RunControl::setRunnable(const Runnable &runnable)
+{
+    m_runnable = runnable;
+}
+
+void RunControl::setConnection(const Connection &connection)
+{
+    m_connection = connection;
+}
+
 QString RunControl::displayName() const
 {
     return m_displayName;