Comment 1 for bug 1858138

Branch with fixes for the above and sandbox demo of simplest case grid, with a mix of auto and manual fields and filtering enabled. Includes some IDL 'selector' additions to Action/Trigger classes to bolster the demo code (and to help with bug #1855780).

https://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/berick/lp1858138-grid-filters-link-selectors-misc