v1.0.0.10

* fix UART parity setting at startup

v1.0.0.9

* improve handling of local echo (Half Duplex)
* change -R and -T options to retry until connected

v1.0.0.8

* add -ob option to set/clear Backspace = DEL (default set)

v1.0.0.7

allow aspect ratio to be locked/unlocked (default locked)

Update AssemblyInfo.cs

v1.0.0.5

add GitHub URL to About dialog

v1.0.0.4

improve handling of failed connections

v1.0.0.3

allow margin bell to be disabled, and reduce volume

v1.0.0.2

more accurate reproduction of terminal beep

v1.0.0.1

improve screen color to more closely match P4 phosphor color