Runtime: work around 1s delay added when using twisted reactor's callLater.

Since wxPython4, using wxReactor from non-main thread was producing
exceptions in wxWidget's C++ code. Then reactor.run() was called from
main thread, and runtime's worker was delegating calls to reactor
with callLater(0, callable).

While this worked perfectly with wxReactor, it did introduce an unexplained
1 second delay to each worker call when using nomal linux reactors
(i.e. without wxPython). As a workaround reactor runs in a thread when using
twisted without wxPython

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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"))