`WDL`
* Restore interpolation placeholder options (sep, default, true, false) as they're deprecated, not removed from WDL 1.1
`miniwdl check`
* Command-line option to suppress certain warning(s) globally: `--suppress Warning1,Warning2`
* `--suppress CommandShellCheck` replaces `--no-shellcheck`
* WDL 1.1 warnings for newly-deprecated coercions and placeholder options