Cleanup:
1. output window pane variable renamed to reduce confusion
2. removed unneeded reference and using directives
3. helper for accesing output window
Cleanup - remove using directive.
Making "thread" and "process" objects bound to cppheck.exe non-static.
Merge pull request #8 from Dmitry-Me/removestaticprocess

Clean code and make "process" and "thread" non-static