IDE: Fix missing highlighted element in diagrams when using GTK3

- wx's logical function does not work on gtk3, and highlighting relies on it
- skipping logical funciion at all "works" but this now makes highlight opaque
- no easy fix for highlight transparency since emulated with AND Wx logical function
+ added other highlight related cosmetic fix.

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from __future__ import absolute_import

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from etherlab.etherlab import *

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from util.BitmapLibrary import AddBitmapFolder

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import util.paths as paths

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AddBitmapFolder(os.path.join(paths.AbsDir(__file__), "images"))