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/qmlprojectmanager/qmlprojectrunconfiguration.cpp

@@ -287,6 +287,13 @@ Utils::Environment QmlProjectRunConfiguration::environment() const
     return env;
 }
 
+ProjectExplorer::Abi QmlProjectRunConfiguration::abi() const
+{
+    ProjectExplorer::Abi hostAbi = ProjectExplorer::Abi::hostAbi();
+    return ProjectExplorer::Abi(hostAbi.architecture(), hostAbi.os(), hostAbi.osFlavor(),
+                                ProjectExplorer::Abi::Format_Runtime_QML, hostAbi.wordWidth());
+}
+
 QVariantMap QmlProjectRunConfiguration::toMap() const
 {
     QVariantMap map(ProjectExplorer::RunConfiguration::toMap());