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/code/z_demo.c

@@ -302,7 +302,7 @@ void func_80064824(PlayState* play, CutsceneContext* csCtx, CsCmdBase* cmd) {
             break;
         case 14:
             if (sp3F != 0) {
-                func_800BC490(play, 1);
+                Play_SetViewpoint(play, VIEWPOINT_LOCKED);
             }
             break;
         case 15: