e3f049f4d9
* add VARIANT and VARIANT_DESC to the list of known vars in the drawing sheet editor. * cache variant and variant description in respective objects. * expand the respective text variables when building the drawing sheet. * keep the cached variant and its description up-to-date when selecting a variant in the GUI. * pass variant and its description to the plotters. Fixes https://gitlab.com/kicad/code/kicad/-/issues/23430