First browser tests
browser fixes
bug fix: missing call to parent constructor

If the QObject constructor is not called, QML can't recognize the object.
Little changes
"fileType" instead of "type" to know if it's a folder
openUrlExternally(folder ... to know the real path of the file
IMages of images file are visible
Improve the fileModelBrowser
create a fileName,
create isSelected ...
First test to load files according to a filter
Improvement for the name Filter
Use of os.path.splitext()
Images are now ok with Windows and Linux
The filter is working
Little changes to test filterChanged and folderChanged
We can change folder by different way
folder open by enter a path, by doubleClick on a folder or by click on Open button
browser: minor filter fix

When we get the currentIndex changed event, the currentText property has not been updated yet...
Merge branch 'dev_browser' of https://github.com/buttleofx/ButtleOFX into dev_browser

Conflicts:
	buttleofx/gui/browser/qml/FooterBar.qml
You can change filter and it reload files
You can go to the parent directory by clicking on the folder icone.
Clean
Merge branch 'dev_graph' of https://github.com/buttleofx/ButtleOFX into dev_browser
Fixed open and save filedialogs