Merge topic 'cmRange-API'

8d336875 cmMakefile: Use Ranges for buildsystem property access.
514a1dff cmAlgorithms: Add some convenient typedefs.
c7b39d06 cmMakefile: Split accessors for include directories and origins.
b2de25ad cmMakefile: Split accessors for compile options and origins.
d6239507 cmMakefile: Split accessors for compile definitions and origins.
ef17bbef cmMakefile: Separate storage of buildsystem properties and their origins.
a89c02ce cmMakefile: Out of line some API.
b19587e7 cmMakefile: Remove some references from APIs.
1fe71e2e cmAlgorithms: Move Range type out of private namespace.
8ea0b81d cmAlgorithms: Rename cmRange to cmMakeRange.