Add edit buttons for timer widget

Łukasz Korbel requested to merge lkorbel/kdeplasma-addons:master into master

Up/down buttons for each timer's sections allow for easy modification of time by 1h, 1min and 1s similar to SpinBox. Those buttons are implemented using new button type - SvgButton.

Addtional changes:

  • Add control buttons below main widget for start, stop and reset timer.
  • Improve add button in settings page of predefined timers.

FEATURE: 397841 FIXED-IN: 5.21

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