[API BREAKING] Rename Xgit.Core.* modules to Xgit.*.

[scouten]

Changes in This Pull Request

Another piece of the simplification / refactoring in progress: I think we no longer need the .Core namespace for Xgit modules.

Checklist

• This PR represents a single feature, fix, or change.
• All applicable changes have been documented.
• There is test coverage for all changes.
• All cases where a literal value is returned use the cover macro to force code coverage. n/a
• Any code ported from jgit maintains all existing copyright and license notices.
• If new files are ported from jgit, the path to the corresponding file(s) is included in the header comment. n/a
• Any TO DO items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment. n/a

[codecov]

Codecov Report

Merging #257 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #257   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          29     29           
  Lines        1337   1337           
=====================================
  Hits         1337   1337

Impacted Files	Coverage Δ
lib/xgit/content_source.ex	100% <ø> (ø)
lib/xgit/object_id.ex	100% <ø> (ø)
lib/xgit/file_content_source.ex	100% <ø> (ø)
lib/xgit/ref.ex	100% <ø> (ø)
lib/xgit/dir_cache.ex	100% <ø> (ø)
lib/xgit/repository/working_tree.ex	100% <ø> (ø)	⬆️
lib/xgit/repository/on_disk.ex	100% <ø> (ø)	⬆️
lib/xgit/file_path.ex	100% <ø> (ø)
lib/xgit/tree.ex	100% <ø> (ø)
lib/xgit/file_mode.ex	100% <ø> (ø)
... and 10 more

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