* Fixed a crash that occurred in the baking step when cancelling a scene capture which was triggered by changing an option which invalidated all photo sets (i.e., render capture resolution or capture anti aliasing). This was occurring because the baking step proceeded after the scene capture cancellation and the needed photosets were empty.
* Fixed a crash which can happen if you have no channel enabled, change cleanup tolerance from 0 to 1 and then enable the BaseColor channel. This was fixed by changing the behavior of the Cleanup Threshold property, if its positive the DeviceDepth capture is enabled and its disabled otherwise, previously we also required that another channel was enabled which led to the crash in the baking step. The new semantics are easier to understand in the code and and is probably an improvement to the UX as well since the Cleanup Threshold property behavior does not depend on other properties.
* Improved the scene capture cancellation: Users can now cancel the scene capture when the tool is starting up which is better UX since if they picked slow settings they don't intend to reuse, the capture can be cancelled, also, the code is simpler. Changed the behavior of the BakeRC tool properties so that after cancellation the completed captures with the desired settings are enabled. The old behavior where cancellation was documented to restore old results was broken and cannot be made to work unless we store the old results in a separate scene capture but for high capture resolutions that would require a lot of memory. When the SceneCapture is cancelled the channels which were pending and didn't complete are logged in the Output Log in case the user forgets which ones were enabled.
* Simplified the code in various places: Added `operator[](ERenderCaptureType)` to structs with per-capture data, and use it to simplify many places where we previously checked channels individually. Added conversion functions from tool properties/geometry script parameters to the render capture parameters. Removed old confusing logic that determined if a capture had been updated by tracking the number of photos in each photoset with a new system based on a new per-capture pending state. Deprecated a bunch of functions which are no longer useful or which used the wrong types (e.g., `FRenderCaptureUpdate` was added because I hadn't noticed `FRenderCaptureTypeFlags`). Changed the defaults in `FSceneCapturePhotoSet` so that the DeviceDepth capture is off, its an advanced feature and the defaults are intended to make the class friendly to new developers
#rb lonnie.li
[CL 26569987 by matija kecman in ue5-main branch]
Fixed materials in the BakeRC tool missing UV layer switches or controls for brightness of the Base Color, Subsurface Color or Emissive channels
Removed the unused AO Multiplier setting that appeared in the Preview panel of the tool UI
Improved performance of BakeRC tool baking step by not recomputing the target mesh spatial index and uv charts
Improved the clarity of the analytics code since the sub-classing has enabled us to more easily use custom BakeRC analytics
#rb lonnie.li
#rnx
#preflight 63cfaa1ed83c1837b182104b
#jira none
[CL 23828120 by matija kecman in ue5-main branch]
The crash that was fixed occured when, for example, the userturned off a capture channel while the baking background compute was running
The refactoring has enabled the tool to only bake the newly captured channels only, previously when the scene capture was incrementally updated all pre-existing channels were baked again
The refactoring should enable us to more easily support a feature where the user toggles capture directions or adds new ones manually
#preflight 63c02c46345a532dfc273e6a
#rb lonnie.li
#rnx
[CL 23663959 by matija kecman in ue5-main branch]
- When adding a new channel: Only the newly requested channel is captured, previously all enabled channels were (re)captured
- When removing an already captured channel: We no longer recompute all remaining channels, we just wipe the one that was removed
#rnx
#rb ryan.schmidt
#preflight 6372120fbf76990b71f17750
[CL 23115901 by matija kecman in ue5-main branch]
