* reuse-managed license/copyright headers
reuse is a tool for compliance with the REUSE recommendations. See
<https://reuse.software/> for more information, and
<https://reuse.readthedocs.io/> for the online documentation.
* Set jsoncpp license
* Add MIT license for Decklink sources
* Explicitly license examples/
- Add headers to source files
- Change blanket licensing in .reuse/dep5 to only cover binary media
- Import CC-BY-3.0 license and assign to sintel_trailer
- Parsing from string to Json::Value is now done by utility function
openshot::stringToJson() in Json.cpp, all SetJson() methods call it.
- Expand use of const member functions and args where appropriate.
- Use std::to_string() to format int/float values as strings.
- Correct mentions of nonexistent Json::JsonValue type in docstrings
`Json::Reader` has been deprecated for some time, so we replace it with
`Json::CharReader` generated by a `Json::CharReaderBuilder`, or (in the
one instance where we have a stream as input) `Json::parseFromStream();`
* Refactor of Coorindate and Keyframe optimized for performance (much faster than previously). Also refactored FrameMapper to not use a Keyframe, and to only process frame mapping when needed... speeding up Json loading of project files.
* Fixing FrameMapper linear calculation to match existing Keyframe calculation
* Fixing Keyframe to pass original unit tests, and correctly calculate the Keyframe repeat fractions and deltas.
* Small refactor of time mapped logic in Clip.cpp
