* Allow custom drive image sizes in the bespoke UI. Addresses Issue#748
* Clarify what the Pi repo mirror setup is good for.
* Use the number input type for rudimentary input validation.
* Append byte unit.
* More granular input validation using html5 attributes. Max allowed input is 256GiB in bytes.
* Correct use of html5 number input elements.
* Add capabilities to RaCtlCmds.get_device_types() to return the image file support boolean, and list of supported block sizes.
* Inquire rascsi backend about the min block size rather than hard coding values in the web UI.
* Add class methods for getting lists of certain device types.
* Use the new class methods to get lists of device types in the web ui.
* Make use of the new class methods in the oled script.
* Remove now unused constants, and simplify logic in common_settings
* Improve device name mapping to extend the existing dictionary rather than creating a new data structure.
* Use jinja2 sort filters instead of sorting in python code. Removing redundant variables.
* Introduce the get_device_name() utility method which returns the translated name for a device acronym. Use the new method to display device name when attaching devices.
* Fix typo
* Rename Support Device to Periperal Device. General tweaks to UI strings.
* Tweak UI string.
* Fix error.
