Run upgrade from system menu and signal handling #307
Merged
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This PR adds the ability to check for, and initiate, an upgrade from the system menu.
In addition, this PR changes the UI to respond to the following OS signals:
The general menu button definitions, and view rendering, has been refactored into a more modular, configurable form by standardising the
buttons.py
andview.py
API so these modules can be dynamically imported from subpackages.Finally, the long press is made a little more predictable by waiting slightly longer before it repeats the event. This means it's easier to create a single long press event, allowing more predictable navigation through books.