Fix help dialog running out space

Plus fix a minor bug in the first-run dialog

Making graying out leading zeros optional

Reorder empty stack help message text

eeer oops actually actually fix Y=

Save and restore stack on exit/resume

Minor fixes

Updating battery level would draw battery icon even when hidden
Interacting with widgets now resets the cursor

Forgot a key

Save and restore user settings to appvar

Fix broken signed right shift

Plus fix broken stack top swap and add stack manipulation keys

Basic UI demo now works