D18319: Improve LiveDataDock and import widget

[Christoph Roick]

croick created this revision.
croick added a reviewer: LabPlot.
Herald added a project: KDE Edu.
Herald added a subscriber: kde-edu.
croick requested review of this revision.

REVISION SUMMARY
  - settings are only applied to the element selected first in the project explorer
  - add name (editable) and source (read-only) line edit
  - optimize access to MQTT host data (reduce QMap searches)
  - disable/enable reading type options for different source types
  - distinguish MQTT source by host name and port
  - allow different LiveDataSources from the same host

TEST PLAN
  - create new LiveData sources (Ascii, ROOT, MQTT)
  - select several of them in the project explorer, but edit only one
  - change name in dock widget

REPOSITORY
  R262 LabPlot

BRANCH
  livedock

REVISION DETAIL
  https://phabricator.kde.org/D18319

AFFECTED FILES
  src/backend/datasources/MQTTClient.cpp
  src/backend/datasources/MQTTClient.h
  src/kdefrontend/GuiObserver.cpp
  src/kdefrontend/MainWin.cpp
  src/kdefrontend/datasources/ImportFileWidget.cpp
  src/kdefrontend/dockwidgets/LiveDataDock.cpp
  src/kdefrontend/dockwidgets/LiveDataDock.h
  src/kdefrontend/ui/dockwidgets/livedatadock.ui

To: croick, #labplot
Cc: kde-edu, narvaez, apol
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