texlab: update to 5.16.0.

Added

    Add texlab.experimental.labelDefinitionCommands setting to customize the list of \label-like commands
    (#1093)
    Extend list of commands treated as command definitions and environment definitions (#1087)
    Allow the server to trigger the forward search in an editor-agnostic way:
    Running texlab inverse-search --input <FILE> --line <LINE> will open the specified document in the editor if the client supports it
    (#1091)

Fixed

    Fix detection of log dir when using latexmkrc (use $aux_dir instead of $out_dir) (#1079)
    Fix extracting $aux_dir and $out_dir from latexmkrc (#1079)
    Add support for extracting $aux_dir and $out_dir from latexmk >= v4.85 ((#1079))
    Improve log file change detection under Windows
    Cleanup diagnostics of deleted files
    Let \declaretheorem accept a list of environment names instead of just a single name (#1075)
    Use configured directories if not set explicitly by latexmkrc file (#1095)

(wiz)