v0.2.0

The three big things in this release are

• a major UI rework
• major redesign of how spectrograms are represented, which mean rSTRF now properly handles live-recorded (i.e. variable-rate) STRF data
• signal export (out.dat)

In addition, there's a bunch of new features, bugfixes and big performance improvements on large datasets.

Thanks a lot to the people in #rstrf (especially Ben and Jan for being beta-testers and Cees for the explanations of STRF's design).

For a full changelog, see CHANGELOG.md.