Fixed single-application instance issue using QSharedMemory since the single application class is deprecated
Refocus on existing instance. Changed window name.
Fixed unnecessary include.
Added window_title.cpp
Modified main to improve portability
Implemented show result.
Merge pull request #230 from angathorion/show-result

Show result
Merge pull request #218 from angathorion/single-app-fix

Fixed single-application instance issue
Clean up state after test too

Because content is not serializable by upper layers.