D29300: [KJots] Add support for headings

[Igor Poboiko]

poboiko created this revision.
poboiko added a reviewer: dvratil.
poboiko requested review of this revision.

REVISION SUMMARY
  This patch adds support for headings, introduced for underlying `KRichTextEdit` in D28854: [KRichTextWidget] Add support for headings <https://phabricator.kde.org/D28854>.
  It adds relevant actions to toolbars & menu.
  This also increases the required KF5 version to (not yet released) 5.70.
  
  Slighly overlaps with D29291: [KJots] Provide explicit "Save" action <https://phabricator.kde.org/D29291> (which increases the version in .rc-file)

TEST PLAN
  it compiles, actions are added (and functional)

BRANCH
  headings (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D29300

AFFECTED FILES
  CMakeLists.txt
  src/kjotsedit.cpp
  src/kjotspartui.rc
  src/kjotsui.rc

To: poboiko, dvratil
Cc: kde-pim
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