Also fixes some bugs in storing exclusions in symbol fields and children. Also fixes some bugs in checking for resolved text variables in symbol children. Fixes https://gitlab.com/kicad/code/kicad/-/issues/18279
Fixes https://gitlab.com/kicad/code/kicad/-/issues/14761
Defaults to off because this is likely contentious Fixes https://gitlab.com/kicad/code/kicad/-/issues/17870