Move more non-public headers into project-level visibility
Move more non-public headers into project-level visibility

For OS X and iOS Cedar Frameworks.

[#86772420]

tjarratt/cedar,pivotal/cedar,briancroom/cedar,idoru/cedar,idoru/cedar,hsienchiaolee/cedar,idoru/cedar,tjarratt/cedar,hsienchiaolee/cedar,irfanah/cedar,jeffh/cedar,pivotal/cedar,jeffh/cedar,briancroom/cedar,irfanah/cedar,jeffh/cedar,pivotal/cedar,briancroom/cedar,pivotal/cedar,irfanah/cedar,tjarratt/cedar,hsienchiaolee/cedar,jeffh/cedar,pivotal/cedar,idoru/cedar,irfanah/cedar,hsienchiaolee/cedar,briancroom/cedar,briancroom/cedar,tjarratt/cedar,jeffh/cedar,idoru/cedar,tjarratt/cedar