This is a minor release of ggalign. It adapts more classes and methods to the
new S7 system. Since there are few reverse dependencies, these changes do not
impact other packages.

## R CMD check results
0 errors | 0 warnings | 0 note

## revdepcheck results

We checked 1 reverse dependencies (0 from CRAN + 1 from Bioconductor), comparing R CMD check results across CRAN and dev versions of this package.

 * We saw 0 new problems
 * We failed to check 0 packages
