zen-fs/core v0.3.0 on GitHub

Added mixins for adding implementations for various use cases:
- Sync: Implements async methods using the sync methods
- Async: Implements sync methods to throw ENOTSUP
- Readonly: Implements methods that makes changes to throw EROFS
- They are used in the extends clause by wrapping any base file system, like so:
```
 class MyFS extends Readonly(Sync(FileSystem)) { /* ... */ }
```
- Note that decorators are not used since they can not modify the resulting type.
Removed SyncFileSystem, AsyncFileSystem, ReadonlySyncFileSystem, and ReadonlyAsyncFileSystem (use mixins)
Changed LockedFS to named export
Narrowed usage of no-unused-vars in filesytem.ts
Removed isIndexDirInode and isIndexFileInode (bloat)
Renamed IndexInode.isDir to IndexInode.isDirectory
Exported ListingQueueNode
Removed FileSystem.Name
Added public modifier to FileSystem members that were missing it.
Readded FileIndex
Added FileIndexFS, SyncFileIndexFS, and AsyncFileIndexFS

zen-fs/core v0.3.0 0.3.0 on GitHub