URI encoding for Windows OS

@timbl @angelo-v
The following PR in 2017 rejects the use of : | / in POST. I suppose it was to preserve the possibility to use NSS on windows.
https://github.com/solid/node-solid-server/commit/5bba6c931fe0b319b6b350b8338b6e144b0b67fa#diff-98a11be785b8100aab3a553eed0e3656a235f06463d2979fd08bafcdf503abdf

      slug = decodeURIComponent(slug)
      if (slug.match(/\/|\||:/)) {
        throw error(400, 'The name of new file POSTed may not contain : | or /')
      }

Using longChat in chat With Me encounters some problem because this control is not applied on PUT, when creating intermediate folders.
see https://github.com/solid/chat-pane/issues/51

I suppose we need some coherence, what is your position :

1. remove the control in POST
2. add the control in all write functions including PUT PATCH (filename and intermediate containers)

まずコミット 5bba6c931fe0b319b6b350b8338b6e144b0b67fa と POST、PUT、PATCH の書き込みパスを確認し、次に solid/chat-pane#51 で説明されている longChat の失敗と比較します。':', '|'、'/' の扱いが POST、PUT、PATCH、ファイル名、中間コンテナで一貫しており、選択した動作が文書化されているか、関連するテストでカバーされていれば完了です。