Adding public headers into include directory

[HakanAcundas]

Description

Refactoring folder layout.
Moving libCZIPublicHeaders files into the newly created inc directory for separate the public and private header files.

Fixes # (issue)

Type of change

Refactoring folder layout

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

With the new folder layout, I run unit tests of libczi and downstream projects (LibCZI_NET, imgdoc2).

Checklist:

• I followed the Contributing Guidelines.
• I did a self-review.
• I commented my code, particularly in hard-to-understand areas.
• I updated the documentation.
• I updated the version of libCZI following Versioning of libCZI depending on the type of change
  • Bug fix -> PATCH
  • New feature -> MINOR
  • Breaking change -> MAJOR
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.08%. Comparing base (cc79cff) to head (997968e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #150   +/-   ##
=======================================
  Coverage   66.08%   66.08%           
=======================================
  Files          88       88           
  Lines       11265    11265           
=======================================
  Hits         7445     7445           
  Misses       3820     3820           

Flag	Coverage Δ
windows-latest	66.08% <ø> (ø)

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[ptahmose]

I wonder whether line 422-423 needs to be adapted as well. I guess we'll need to test a vcpkg-build for this.

[ptahmose]

I wonder... while we are at it, should we move all other files in the the libCZI-folder (i.e. everything but the new inc-folder) into a new folder "src" (or something like this). Would this look "more tidy"?

[HakanAcundas]

I wonder... while we are at it, should we move all other files in the the libCZI-folder (i.e. everything but the new inc-folder) into a new folder "src" (or something like this). Would this look "more tidy"?

I think the same, since together with src folder, people will understand the purpose of the folders more easily.