FileBrowser.java
-Fixed bug in loadAll() method where thumbnails for multi-page directories were not being instantiated.
-Adjusted positioning of thumbnail images and labels.
-FileBrowser no longer closes if open button is clicked while multiple directories are selected but no files.

visualthumbnailUI.java
-Fixed bug where loading VisualItems did not update the VisualItem list if the list was not empty.
-Selected items are now highlighted.
-Folded drawBackgroundCanvas() method into drawThumbNails() method.
-Instead of storing selected VisualItems, selected indeces stored.
-ArrayList of selected VisualItems constructed in returnSelectedItems() method.
-Removed oldListSize variable.
-Folded window boundary definitions into single array.

visualTimeline.java
-Added file header.
-Added array defining timeline boundaries.