api refactoring

    - skcms_ICCProfile_foo() -> skcms_Foo()
    - reorder function arguments to be read-only first, then outputs later
    - tuck away skcms_Curve as Curve in ICCProfile until needed

Change-Id: Id9b417a058c4e61d8ee3cb2878e16173b7780d02
Reviewed-on: https://skia-review.googlesource.com/107401
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
9 files changed