refactor(Core/Camera): Refactor Camera Docs, implement a missing function
refactor(Core/Camera): Refactor Camera Docs, implement a missing function

Refactor Camera code, moving unimplemented functions together, Fix docs to remove bad references,
update function defs to be more clear

Kitware/vtk-js,Kitware/vtk-js,Kitware/vtk-js,Kitware/vtk-js