Picframe

configuration.yaml` will change

- Fix 167
- Fix 166
Make it configurable, that picframe follows symbolic links.
configuration.yaml
`YAML
model:
...
follow_links: False default=False, By default, picframe will not walk down into symbolic links that resolve to directories. Set follow_links to True to visit directories pointed to by symlinks, on systems that support them.

`
- make Exif Tag search more flexible
- Fix 164

Changes:
- update noto fonts to latest version (and License)
- 119
- 139
- 144
- 148
- this will break the old home assistant integration
- 153
- bump pi3d to v2.47

There are no changes to `configuration.yaml. So one can reuse the old one.

I described how to setup home assistant integration or upgrade the integration in the [wiki](https://github.com/helgeerbe/picframe/wiki/Homeassistant)

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

- fix issue \ 115: unable to toggle directory overlay via MQTT
- error trapping in exif getting
- option to log to file (new keys in confuguration.yaml)
- issue \128: image display stats in db