Some fixes

* make qt configuration in CMake more flexible
* move creating of symlinks on windows from post build event to cmake
* create symlinks for test data in cmake on windows
* switch to 7zip for extraction python indexer
* make results of sourcegrouptests case insensitive

bin/test/data/SourceGroupTestSuite/cxx_codeblocks/expected_output/output_windows.txt

@@ -1,5 +1,5 @@
-SourceFilePath: "src/Test.cpp"
-	IndexedPath: "src/Test.cpp"
+SourceFilePath: "src/test.cpp"
+	IndexedPath: "src/test.cpp"
 	IndexedPath: "test/indexed/header/path"
 	CompilerFlag: "-isystem"
 	CompilerFlag: "data/cxx/include/"
@@ -18,5 +18,5 @@ SourceFilePath: "src/Test.cpp"
 	CompilerFlag: "test/framework/search/path"
 	CompilerFlag: "-local-flag"
 	CompilerFlag: "-std=c++11"
-	CompilerFlag: "src/Test.cpp"
+	CompilerFlag: "src/test.cpp"
 	ExcludeFilter: "**/excluded/**"