Table plotting for PCBNew.

Also fixes some bugs with property exposure that (along with
other things) allowed you to put table cells on a different
layer than their parent table.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/17438

common/eda_shape.cpp

@@ -2050,6 +2050,14 @@ static struct EDA_SHAPE_DESC
         auto fillAvailable =
                 [=]( INSPECTABLE* aItem ) -> bool
                 {
+                    if( EDA_ITEM* edaItem = dynamic_cast<EDA_ITEM*>( aItem ) )
+                    {
+                        // For some reason masking "Filled" and "Fill Color" at the
+                        // PCB_TABLECELL level doesn't work.
+                        if( edaItem->Type() == PCB_TABLECELL_T )
+                            return false;
+                    }
+
                     if( EDA_SHAPE* edaShape = dynamic_cast<EDA_SHAPE*>( aItem ) )
                     {
                         switch( edaShape->GetShape() )