Abstract scope class AbstractScopeWidget added.
* Scopes (Waveform, Vectorscope, Parades, etc.) can inherit from AbstractScopeWidget * Takes care of widget appearance (like colors) * Manages multi-threading * Will manage realtime updates and other things that make sense Waveform is already inheriting from AbstractScopeWidget. svn path=/trunk/kdenlive/; revision=4602
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