use unicode minus sign
factor out TableView and KeypadAdapter
use dialog for radix selection
add prefixes display ability to units keypad
use declared fields in unit prefixes lookup
show prefix buttons
sort unit prefixes by exponent
limit units simplification on arithmetic operations
pass state to operations, respect angle unit in trigonometric operations
set angle unit on startup
move common calculator state into separate class
autofit button labels
factor out font fitting algorithm into separate class
imports cleanup
add minimum text size to font fitter
fit text size in main input box
make unit help popups a little cleaner
units manager accepts any string-like object as key for getting units
move units lookup code to units button class
move operation lookup code into operation buttons