Improve File Browser Look and Functionality

[ciacob]

Improve File Browser Look and Functionality. The following should be addressed:

• add a button to "go into" selected folder, next to the "go to parent" folder;
• the controls in the "Folders" pane should be reordered as: Sort order, Go to parent, Go into selected;
• graphic for the sort order indicator should be replaced;
• fix annoyance (not really a bug): when typing the exact name of a file at the current location, its extension is automatically added to what user has typed. User cannot remove it, as it is added again. This should stop.
• add tooltips for all buttons and controls in the window.
• icons and text in list items should change color when the item is selected. See the "Generator Configuration" window for a model on how to implement this.