Framegrab

Fixes a bug where framegrab would sometimes connect to the IR camera on the Logitech Brio instead of the color camera. Framegrab now always connects to the color camera.

Fixes a bug that prevented zoom settings from taking effect on RTSP grabbers

What's Changed
* Allow Environment Variable Substitution for RTSP URLs by blaise-muhirwa in https://github.com/groundlight/framegrab/pull/31
* handle edge case by brandon-groundlight in https://github.com/groundlight/framegrab/pull/32
* On demand grabber by roxanne-o in https://github.com/groundlight/framegrab/pull/33
* Fixing RTSP Grabber Exception Handling by timmarkhuff in https://github.com/groundlight/framegrab/pull/36

New Contributors
* brandon-groundlight made their first contribution in https://github.com/groundlight/framegrab/pull/32
* roxanne-o made their first contribution in https://github.com/groundlight/framegrab/pull/33

**Full Changelog**: https://github.com/groundlight/framegrab/compare/v0.4.6...v0.5.0

What's Changed
* Fixing a bug with the preview CLI command. by robotrapta in https://github.com/groundlight/framegrab/pull/29


**Full Changelog**: https://github.com/groundlight/framegrab/compare/v0.4.5...v0.4.6

What's Changed
* CLI improvements - autodiscover previews images, is more robust by robotrapta in https://github.com/groundlight/framegrab/pull/27


**Full Changelog**: https://github.com/groundlight/framegrab/compare/v0.4.4...v0.4.5

What's Changed
* ensure that python code is rendered as python by blaise-muhirwa in https://github.com/groundlight/framegrab/pull/22
* Fixing threading error when exiting program with ctrl+c by timmarkhuff in https://github.com/groundlight/framegrab/pull/23


**Full Changelog**: https://github.com/groundlight/framegrab/compare/v0.4.3...v0.4.4