Document Viewpoints and Scene Cam Types (#1285)

* Document bgCamData

* More changes and cleanup

* More docs

* Clarify comments

* PR Feedback, rename bgcheck functions

* remove fallthrough cleanup (other pr that deals with that)

* PR Suggestions

* bug report

* bgCamDataIndexBeforeUnderwater

* PR/Discord Discussions

* Missed some

* sync function header args

* Another suggestion

* cleanup

* Comments

* Indoor BgCamData

* Change bgCamData to s16 for now

* PR suggestions

* the

* use "info"

* Missed a suggestion

* Update and sync docs

* More docs

* Even more docs

* Revert macro

* Add comment

* Better comments

* More cleanup

* Better Cam Scene Docs

* Small change

* Market -> Pivot

* "only"

* swap

* Better comment

* Another comment

* to

* Implement suggestions from discord

* Discord Discussion

* Revert bgCamFuncData to Vec3s

* cleanup

* Remaining cleanup

* docs cleanup

* format

* More docs

* Improve notes

* Cleanup

* Change enum

* PR Suggestions

* Improve comment

* Rephrase

* Implement discussion from discord

* Discord discussion

* fixed to locked

* Update comments

* Few more comments

* Update include/z64.h

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

* Update include/z64camera.h

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

* Better comments

* PR Suggestions

* rm numbers

* Update src/code/z_play.c

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

src/overlays/actors/ovl_Demo_Kankyo/z_demo_kankyo.c

@@ -333,7 +333,7 @@ void DemoKankyo_SetupType(DemoKankyo* this, PlayState* play) {
                             play->csCtx.segment = gAdultWarpInCS;
                         }
                     }
-                    if (func_800C0CB8(play) != 0) {
+                    if (Play_CamIsNotFixed(play)) {
                         gSaveContext.cutsceneTrigger = 1;
                     }
                     DemoKankyo_SetupAction(this, DemoKankyo_DoNothing);