support fileDirname variable in roots configuration #31
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opa.roots
already supports the conventional${workspaceFolder}
built-in variable. This PR adds another conventional and useful variable:${fileDirname}
which is resolved with the directory of the file opened in the active window. This was also mentioned in #27 where a user intuitively tried to use this but the extension didn't support it then.for reference: https://code.visualstudio.com/docs/editor/variables-reference