Wcmatch

- **FIX**: Rework `glob` relative path handling so internally it is indistinguishable from when it is given no relative
path and uses the current working directory. This fixes an issue where `pathlib` couldn't handle negate patterns
properly (`!negate`).

- **FIX**: Fix case where a `GLOBSTAR` pattern, followed by a slash, was not disabling `MATCHBASE`.
- **FIX**: Fix `pathlib` relative path resolution in glob implementations.

- **FIX**: In `glob`, avoid using up too many file descriptors by acquiring all file/folder names under a directory in
one batch before recursing into other folders.

- **NEW**: Add `wcmatch.pathlib` which contains `pathlib` variants that uses `wcmatch.glob` instead of the default Python glob.
- **NEW**: `escape` and `raw_escape` can manually be forced to use Windows or Linux/Unix logic via the keyword only argument by setting to `False` or `True` respectively. The default is `None` which will auto detect the system.
- **NEW**: The deprecated flag `FORCECASE` has now been removed.
- **NEW**: The deprecated functions `globsplit` and `fnsplit` have been removed.
- **NEW**: The deprecated variables `version` and `version_info` have been removed.

- **FIX**: Regression for root level literal matches in `glob`.
- **FIX**: Bug where `glob` would mistakenly abort if a pattern started with a literal file or directory and could not match a file or directory. This caused subsequent patterns in the chain to not get evaluated.

- **NEW**: Add `CASE` flag which allows for case sensitive paths on Linux, macOS, and Windows. Windows drive letters and UNC `//host-name/share-name/` portion are still treated insensitively, but all directories will be treated with case sensitivity.
- **NEW**: With the recent addition of `CASE` and `FORCEUNIX`, `FORCECASE` is no longer needed. Deprecate `FORCECASE` which will be removed at some future point.