D21074: [System Monitor] Port settings window to QQC2+Kirigami FormLayout and modernize UI

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: VDG, Plasma.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  - Port to QQC2+Kirigami FormLayout style, except for the SpinBox which cannot handle decimal values well in the QQC2 version
  - Use standard import names
  - Adjust some strings to sound a bit more natural

TEST PLAN
  Tested with all the variants (CPU, network, etc). All features still work and settings
  are saved and loaded properly.
  
  F6814614: CPU monitor.png <https://phabricator.kde.org/F6814614>

REPOSITORY
  R120 Plasma Workspace

BRANCH
  systemmonitor-modernize-settings-page (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D21074

AFFECTED FILES
  applets/systemmonitor/common/contents/ui/ConfigGeneral.qml

To: ngraham, #vdg, #plasma
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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