new features
* clock overlay (still work in progress)
* including mqtt switch to turn clock on/off
* auto discovery of switch in home assistant
* new parameters in `configuration.yaml`
* `YAML
show_clock: False default=False, True shows clock overlay. False does not show clock overlay
clock_justify: "R" default="R", clock justification L, C, or R
clock_text_sz: 120 default=120, clock character size
clock_format: "%I:%M" default="%I:%M", strftime format for clock string
`
fixes
* issue 131, update of pi3d dependency to version >= 2.46
* issue 135 , Typo in GPS code