Extending a scene sequence allows for more complex switching setups, but should also simplify some setups.
Sequences like "A -> B -> A -> C", which previously were only possible by creating a copy of A, can now be specified in a single entry.
To extend a sequence either select the sequence you want to modify and click the extend sequence button or simply double click the entry.
* use GetWeakSourceName() where possible
* add getCurrentScene() to scene group
* silence OBS warning log and fix typo in audio switch
* extract showing initial status of widgets to function in generic switch
* rework general tab UI
* rework audio tab UI
* rework media tab UI
* rework time tab UI
* rework random tab UI
* rework window tab UI
* rework sreen region tab UI
* rework sequence tab UI
* rework transition tab UI
* adjust log messages to new format
* fix include path and warning
* highlight widgets to guide users (can be disabled)
* add helper frame for screen region tab
* rename main SceneSwitcher widget to AdvSceneSwitcher to resolve naming conflicts with the frontend tools on certain platforms (e.g. Debian 10)
* add media state 'any'
* adjust media switch handling to support vlc source
* move definitions of switcher structs to separate files
* remove useless comment
* cleanup and silence warnings
* add generic switch
* removed delay on main thread startup as it served no purpose
* clean up ultility.hpp
* do not save switchStr to file as it could cause issues when scenes are renamed
* rename sceneRoundTrip to sceneSequence
* add option to switch if window is maximized to title tab
