Consider reworking *BootTasks & InitialTaskLists settings to be more understandable

[spaceisfun]

https://microsoft.github.io/FactoryOrchestrator/service-configuration/

These 3 settings are hard to understand how to use, and have a lot of overlap. We should consider:

• Consolidate into one single file.
• New TaskList attributes in XML (properties in C#) to denote if the tasklist is a first boot or every boot tasklist.
• All Tasks/TaskLists are returned by QueryTask(), GetTaskListGuids() & similar APIs.
• Consider deprecating GetBootTaskList* APIs.
• App UI shows all TaskLists, but divides between boot and non-boot, or has a UI toggle. This should be done no matter what :)