ToolChain: Refactor toolchain support

Refactor ToolChains in Qt Creator:

 * Allow for several toolchains of the same type
 * Be smarter wrt. guessing what kind of output a toolchain
   produces. This allows us to eventually handle e.g. embedded
   linux setups way better than before.
 * Be smarter wrt. guessing what kind of environment a Qt version
   needs.
 * Improve auto-detection of toolchains a bit
 * Decide on which debugger to use based on the kind of output
   produced by the compiler.
 * Add options page to configure toolchains
 * Remove toolchain related options from the Qt version dialog

Reviewed-by: dt

src/plugins/projectexplorer/runconfiguration.cpp

@@ -36,6 +36,7 @@
 #include "outputformatter.h"
 #include "project.h"
 #include "target.h"
+#include "toolchain.h"
 #include "buildconfiguration.h"
 #include "projectexplorerconstants.h"
 #include <extensionsystem/pluginmanager.h>
@@ -241,6 +242,17 @@ QVariantMap RunConfiguration::toMap() const
     return map;
 }
 
+ProjectExplorer::Abi RunConfiguration::abi() const
+{
+    BuildConfiguration *bc = target()->activeBuildConfiguration();
+    if (!bc)
+        return Abi::hostAbi();
+    ToolChain *tc = bc->toolChain();
+    if (!tc)
+        return Abi::hostAbi();
+    return tc->targetAbi();
+}
+
 bool RunConfiguration::fromMap(const QVariantMap &map)
 {
     m_useCppDebugger = map.value(QLatin1String(USE_CPP_DEBUGGER_KEY), true).toBool();