[ANN] EventRecorder updated (import/export)

Hi,

I forgot to mention that for "EventRecorder" there was another
pass on the code together with Peter Uhnak.

It is now possible to import/export the recordings again and also the
UI was updated accordingly (see attached screenshot)

Works in Pharo 5.0 - you can load the tool from Catalog or by opening
Spotter and entering "EventRecorder".

Have fun
T.