Boilerplate filebrowser dialog.
Merge branch 'develop' into feature/filedialog
Improvements to FileDialog's fileEndsWith functionality.
BootscreenHelper can load graphics from a file path.
Load bitmap graphic from sdcard into the Bootscreen.
Moved FileDialog code into a new package.
Renaming member objects & starting history feature.
Adding a file history feature to the FileDialog class.
Adding an image preview dialog to the file dialog.
Optional cancel button.
Fully implemented file dialog with image preview for bootscreen installation.