plyinteractions 0.99.6

Added validity functions for new classes
Added tests (~90% coverage at this point)
Improved doc:
- Fixed lines with > 80 characters
- Moved generics and classes to separate R files

plyinteractions 0.99.5

Initiated NEWS.md
Internal refactoring:
- Removed paste calls in condition signals
- Moved classes and generic definitions in AllClasses.R and AllGenerics.R
- Fixed R minimum working version (4.3.)
- LazyData set to FALSE following Bioc recommendations
- Added package-level documentation
Improved vignettes