changed DrawMap() function to allow access to named objects of the MapCreator if kept

[TeaElKay]

This implements DrawCreatorMap() function for LC. DrawCreatorMap uses the MapCreator used for the generation of the initial map from Landscape.txt to draw a map with named overlays the same way DrawMap() would. Like DrawDefMap it requires KeepMapCreator=1. The way it is implemented, it can also be used to append named overlays to the MapCreator.

DrawCreatorMap(0,0,LandscapeWidth(),LandscapeHeight(),"map newMap{Rock{y=0};Paper{y=33;};Scissors{y=67;};};")

Would draw a new map using overlays with the names "Rock", "Paper" and "Scissors" if they're defined in the Landscape.txt. Additonally the map "newMap" is appended to the MapCreator, so DrawDefMap(0,0,LandscapeWidth(),LandscapeHeight(),"newMap") is now possible even if newMap was not initially defined in the Landscape.txt

This implementation did not require changes to the C4MapCreatorS2.

Note: The C4MapCreatorS2::GetMap() function does always provide a drawable map if one is present in the MapCreator-Tree (i.e. is defined in Landscape.txt or appended to the MapCreator using DrawCreatorMap) thus calling DrawCreatorMap() will draw a map even if only a named overlay is defined.

[TeaElKay]

After internal feedback, changes were made to the feature. The Function DrawCreatorMap() now no longer exists, its functionality was largely replaced by changes to DrawMap(). If KeepMapCreator=1 is present in the Scenario.txt the MapCreator will be copied and used to draw the map, which allows for the usage of named objects from the Landscape.txt. If the MapCreator isn't kept, the functionality of DrawMap() remains the same.

This removes the feature, that would have appended to the MapCreator. This functionality is still interesting, but it may be added later with a separate function.

(see https://discord.com/channels/373735548659171328/868176023852810300/1259901358119587930 for some of the internal discussion)

[maxmitti]

I am glad that the feature of implicitly adding new named nodes to the map creator has been removed.

I am not too experienced with MapCreatorS2. What happens if a new node has the same name as an existing node?
I am asking specifically from a compatibility perspective.

Fail