* Add FileSystem Interface
* Add OS::FileSystem interface and implementations
* static interface + global Os::init()
* Add test harness
* Implement Os::Directory interfaces and use it in FileSystem::readDirectory
* Add Stub tests for Directory and FileSystem
* wip: modify the interface from Michael feedback
* wip: move functions around and rework interface a little more
* Add Directory rule-based tests
* Refactored Directory for open-create + WIP: FileSystem tests
* Update state tracking mechanism in FileSystem test implementation + add RandomizedTesting
* Replace bounded while-loop with for-loop
* Code cleanup
* fix typo
* Rename FileTracker and code reorganization / clarification
* Code style and add CWD rule
* Clean up tester code
* More cleanup
* Add Posix tests to Os_ut_exe
* Fix DpCatalog readDirectory usage
* Appease CI checks
* Spelling and CI warnings
* Spelling + removing FppConstants include
* Add review changes and todos
* Add Directory::read(Fw::StringBase&) overload
* Refactor copyFileData to iterate over copied size
* Remove FppConstants.hpp include
* Rework moveFile into rename/copy-remove
* Add majestic comments
* Add option to error if dir exist in Fs::createDirectory
* spelling
* include <algorithm> for std::find in tests
* Fix leftover ::CREATE modes in comments and stub tests
* Fix CmdSequencer test case
* Fix memory leak in testing by conditioning the Open rule
* Fix FileManager tests
* Add Directory and FileSystem FPP type definitions; update CMakeLists and clean up comments
* spelling
* Reoder header guards
* Implement changes from peer-review
* read into StringBase with const_cast
* Fix resetSer() call
* Fix spelling
* fix spelling again i guess
* Fix DpCatalog unchecked return value
