CppTools: Add CppToolsBridge

We broke the dependency of
BaseEditorDocumentProcessor *BaseEditorDocumentProcessor::get(const QString &filePath)

It's hiding static calls and it is much easier to do it that way than to
provide a reference to every user. It's also possible to exchange it with
different implementations for different test cases.

Change-Id: Ic74699b45948e8b48f7efb6a1b295ba2641b8951
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/plugins/cpptools/cpptools.qbs

@@ -69,6 +69,9 @@ QtcPlugin {
         "cppsemanticinfo.cpp", "cppsemanticinfo.h",
         "cppsemanticinfoupdater.cpp", "cppsemanticinfoupdater.h",
         "cppsourceprocessor.cpp", "cppsourceprocessor.h",
+        "cpptoolsbridge.cpp", "cpptoolsbridge.h",
+        "cpptoolsbridgeinterface.h",
+        "cpptoolsbridgeqtcreatorimplementation.cpp", "cpptoolsbridgeqtcreatorimplementation.h",
         "cpptools.qrc",
         "cpptools_global.h",
         "cpptoolsconstants.h",