Make it possible to catogorize forwards

[philipsens]

This request comes from an issue in the Frank!Flow (frankframework/frank-flow#716). They want to show different colors for the different types of forwards.

They could just implement a list withing the Frank!Flow, but that would make it possible to oversee new forwards. Implementing this in the Frank!Doc would make it future-proof.

@jjansenvr has made a list of forwards and the categories they belong to:

When thinking about the placing algorithm i found I needed to sort the edges(forwards) to have the happiest flow on top

this is the ordering I use:
success 1
then 2
{any unknown forward (fe from switch} 3
else 4
equals 5
lessthan 6
greaterthan 7
warnings 8
outputWarnings 9
failure 10
outputFailure 11
antiVirusFailed 12
filenotfound 13
notInRole 14
passwordProtected 15
noConversionForwardName 16
exception 17
parserError 18
outputParserError 19

It might be an idea to group the forwards and given them a color:
1 t/m 7 green (succes)
8 t/m 9 yellow (warning)
10 t/m 16 orange (failure)
17 t/m 19 red (exception)

Originally posted by @jjansenvr in frankframework/frank-flow#716 (comment)