Split packages into hpath{,-io,-filepath}

hpath-io/README.md

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+# HPath-IO
+
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+
+High-level IO operations on files/directories, utilizing type-safe Paths.
+
+## Motivation
+
+The motivation came during development of
+[hsfm](https://github.com/hasufell/hsfm)
+in order to have a proper high-level API of file related operations,
+while utilizing type-safe Paths.
+
+## Goals
+
+* high-level API to file operations like recursive directory copy
+* still allowing sufficient control to interact with the underlying low-level calls
+* unit-testing exceptions (because yes, people may rely on them)
+
+Note: this library was written for __posix__ systems and it will probably not support other systems.
+
+## Differences to 'posix-paths'
+
+* has a custom versions of `openFd` which allows more control over the flags than its unix package counterpart
+* adds a `getDirectoryContents'` version that works on Fd
+