Add input sequencing support

[fa1k3n]

The idea is to have a list of inputs that are automatically switched between every X seconds.
Three types of switching

• Single shot - Every camera is switched to in order according to sequence list
• Bounce - As single shot but when last camera is done then the sequence goes back in reverse ; 1-2-3-4-3-2-1.....
• Random - A random camera is selected from list, a selected camera can never get active again until all cameras in list have been active

In should be possible to loop all types. When looping, each switching type will restart from the beginning when it is completed. The Random switching type will re-randomize the inputs before restarting.

[arikorn]

Note: this is actually very difficult to prepackage in the current version of Companion. @Julusian pointed out that normal actions (pretty much anything but internal:wait, is my understanding) will time out after 5 seconds.
The "proper" way to do this is with Time-Interval Triggers, or with sequential groups and the internal:wait action, which isn't accessible to the module developer (see bitfocus/companion#2166 which is about presets, but I think it's universally true for modules. For example you can't do it in an upgrade script either)

[arikorn]

Ironically @dnmeid replied to a comment of mine on giving access to internal actions:

At least the wait action will automatically be added when you declare a preset with the old delay property.

Not sure how much one wants to rely on a feature that has been officially replaced, but there you have it! Maybe it's a "promise" not to remove it until they solved the bigger issue?