better names for `[GET] /workspace/ws_id/files`'s return type's properties.. `size` instead of `filesize` etc.

add info field to GetFileResponseData interface and display the the additional useful data it can contain

removed all code concerning workspace-monitor (feature not used anymore or unclear what benefit it is of)

As in verona-player-interface- 2.1.0 requested, the `playerConfig` in `vopReadyNotification` now

* includes `pagingMode`, `stateReportPolicy` and `logPolicy` from bookletConfig

* includes `unitNumber`, `unitTitle`, `unitId`

* it includes also `unitCount`, which is not part of the verona-2.1.0-interface, but proposed here: https://github.com/verona-interfaces/player/issues/24

fixes #221