use subscript 2 in unit description
use unicode minus sign
fixup! use unicode minus sign
factor out TableView and KeypadAdapter
amend
use dialog for radix selection
amend
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
amend
amend
autofit button labels
factor out font fitting algorithm into separate class
imports cleanup