Move Equal matcher implementation to private namespace

[#77215690]
Move BeCloseTo matcher to private namespace
Move BeFalsy matcher into private namespace
Move BeGreaterThan to a private namespace
Move BeGTE matcher into a private namespace
Move BeInstanceOf matcher to private namespace
Move BeLessThan matcher to private namespace
Move BeLTE matcher to private namespace
Move BeNil matcher to private namespace
Move BeLSameInstanceAs matcher to private namespace
Move BeTruthy matcher to private namespace
Move ConformTo matcher to private namespace
Move Exist matcher to private namespace
Move RaiseException matcher to private namespace
Move RespondTo matcher to private namespace
Move BeEmpty matcher to private namespace
Move Contain matcher to private namespace
Move AnInstanceOf to private namespace

[Finishes #77215690]
Remove stray references to CEDAR_HEADLESS_SPECS

This is now the default behavior in Cedar. In fact, this isn't even
read by Cedar anymore.
Suppress NSLog output for Accelerometer warning