Separation of Notes in Logbook

[mgmart]

First of all I want to congratulate you for this awesome library.

Whilst playing with it, I found some minor inconveniences which I would like to address here.
If there are notes in a Logbook it shows as many entries in the content array. It would be more convenient to have only one entry per note.

    - name : "LOGBOOK"
    ▿ content : 18 elements
      - 0 : "   - Note taken on [2017-01-04 Wed 18:46] \\\\"
      - 1 : "     Note for habit"
      - 2 : "     "
      - 3 : "     Third line of note"
      - 4 : "   - State \"DONE\"       from \"TODO\"       [2016-12-15 Thu 07:45]"
      - 5 : "   - State \"DONE\"       from \"TODO\"       [2016-12-15 Thu 07:45]"
      - 6 : "   - State \"DONE\"       from \"TODO\"       [2016-12-13 Tue 20:19]"
      - 7 : "   - State \"DONE\"       from \"TODO\"       [2016-12-08 Thu 16:18]"
      - 8 : "   - State \"DONE\"       from \"TODO\"       [2016-12-06 Tue 23:08]"
      - 9 : "   - State \"DONE\"       from \"TODO\"       [2016-12-05 Mon 22:10]"
      - 10 : "   - State \"DONE\"       from \"TODO\"       [2016-12-05 Mon 09:41]"
      - 11 : "   - State \"DONE\"       from \"TODO\"       [2016-12-04 Sun 10:45]"
      - 12 : "   - State \"DONE\"       from \"TODO\"       [2016-02-01 Mon 19:37]"
      - 13 : "   - State \"DONE\"       from \"TODO\"       [2015-09-24 Thu 23:59]"
      - 14 : "   - State \"DONE\"       from \"TODO\"       [2015-08-18 Tue 23:59]"
      - 15 : "   - State \"DONE\"       from \"TODO\"       [2015-08-15 Sat 23:59]"
      - 16 : "   - State \"DONE\"       from \"TODO\"       [2015-08-14 Fri 18:07]"
      - 17 : "   - State \"DONE\"       from \"TODO\"       [2015-08-13 Thu 23:59]"

[xiaoxinghu]

It is a temporary solution. All content within Drawers are considered raw data for now. It will be properly parsed later base on the type of the block.