#383 fill undefined property columns and complete header columns

[kirchsth]

related to #383

Property tables have 2 problems
a) if a column is missing then the values of the following columns are moved left too
b) if a header has less columns than the following rows the following rows are truncated too

eg. following code produces following image

@startuml
!include <C4/C4.puml>
!include <C4/C4_Container.puml>

' at b) header has only 2 columns, therefore col3 is not displayed
SetPropertyHeader("", $col2Name="2")
AddProperty($col1="col1")
AddProperty("", $col2="col2")
AddProperty(" ", " ", $col3="col3")
' at a) col4 is displayed in column 2 and not 4
AddProperty("", $col4="col4")

Container(c, "Container")
@enduml

Both problems are fixed with this MR and can be checked via my extended branch

(PlantUML >= v1.2025.1beta9 has a bugfix of b), the hidden columns based ob incomplete headers, but I still added this fix, that it works with older versions too)

BR
Helmut