added filesystem concept documentation
Creted filesystem objects
progress in filesystem
Added very basic folder support.
Fixed indention.
Moved meta type registration.
added code style file
Added folder listing.
merged with master
Added local file support.
Fixed some filesystem bugs.
Addeed better handling for windows path.
Added basic filesystem documentation.
Added scroll position persistence for query editor.
Input field was changed from QTextEdit to QPlainTextEdit.
Added support for QT5
Code review.