feat: glob patterns are relative to the config file.

[Jason3S]

At the moment, the glob patterns are not consistently checked. The VS Code extension and the cspell cli have slightly different rules (they provide different roots). This leads to unnecessary **/ being added to patterns as well as patterns not matching when they should.

Feature:

1. Glob patterns shall be considered relative to the file they are defined in.
2. It is possible to define a globRoot to override the default behavior. If globRoot is undefined it will default to the location of the configuration file. globRoot can be relative to the file location. If a project/.settings/cspell.json file has a globRoot of .., then the globRoot will become project. To have the root be the current working directory, use ${cwd}.
3. It is also possible to define a root for each glob pattern.