donate/Supporters: Page improvement

Improve page & add update script

• We refer to the ongoing campaign supporters as 'supporting members' as on our donation page. A script is also included to update from the Donorbox output.

Add ability to sort donators list

• The list is baked supported by time, and is currently randomly sorted in QML. This adds an action to specify sorting by either random, name or time.

Add ability to filter donators list

• Adds an action to filter through the list, ignoring accents/case