[BLUEJ-1345] Different highlight colour for constructs in Java editor

This point was discussed within the team after receving the suggestion on the support email by Carlos Guevara on 1st April.

The idea is reasonnable, and should be thought through in more length for a future version of BlueJ (post 5.0.1).

One argument about it: in Stride, we actually do make a distinction between constructors and methods.

(Please keep Carlos informed on the progress)

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