Support multiple header paths in the project manifest

[kwridan]

Is your feature request related to a problem? Please describe.

Existing projects may not have all their header files in a single directory, as such it may be challenging to define a single glob pattern to include all required headers. This becomes more challenging when different header types (public, private & project) are all within the same directories.

Describe the solution you'd like

Add support to specify array of paths / glob patterns for headers:

e.g.

Headers(public: ["Sources/A/**/*.h", "Sources/B/**/*.h"],
        private: ["Sources/C/**/*.h", "Sources/D/**/*.h"],
        project: ["Sources/E/**/*.h", "Sources/F/**/*.h"])

Describe alternatives you've considered

An alternate is to move code around to group all public, private and project classes.

e.g.

• Sources
  • Public
    • Foo.h
    • Foo.m
  • Private
    • Bar.h
    • Bar.m
  • Project
    • FooBar.h
    • FooBar.m

Additional Context

Both sources and resources have been updated to support multiple paths / glob patterns (e.g. #266) - a similar approach can be adopted here.

Reference

What about headers that are outside of the scope of "Support" dir and still should be project headers?

Originally posted by @zdnk in #352 (comment)