Feature

• New el.sampleseq node for sequencing sample playback (similar to el.sparseq2)
• New el.round node to complete the trio with el.floor and el.ceil
• New el.skcompress soft-knee compressor (#34 by @Mozoloa)
• Runtime::snapshot method for capturing the internal graph state

Improvement

• Added a CMake namespace alias so that linking against the runtime subdirectory can be written elem::runtime

Bugfix

• Fixed a bug in el.compress which had inverted the behavior of the ratio parameter (#34 by @Mozoloa)