Clean up world.py code with use of new dict variable "currentSectionsDict"

[EricFedrowisch]

I hope to replace several for loops that search thru a list of section objects, checking the section.name value for each with the creation of a dictionary that has the section names as keys that point to the section instance. This would make for shorter code, simpler code. Possibly marginally faster code.

[EricFedrowisch]

In world.py, there are many for loops created like this:

for figure in world.figures:
    for section in self.currentSections:
        if figure.section == section.name:
            //do stuff

I feel these for loops probably create unnecessary overhead. I am going to try and use a dictionary that is updated with the section names as keys that will be updated at the same time the sections are loading. Something like this:

for figure in world.figures:
    if figure.section in currentSectionsDict:
         //do stuff

This is shorter and uses a dictionary lookup in an existing hash table which I think is probably much faster than initializing a for loop to search through the current sections.

[EricFedrowisch]

Imp'd.