x11/qterminal: update to 0.15.0

qterminal-0.15.0 / 2020-04-24
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  * Bumped version to 0.15.0.
  * CMakeLists: Do not use Qt5X11Extras on macOS.
  * Replace deprecated/removed Q_WS_MAC macro with Q_OS_MACOS.
  * Fixed the default font on macOS.
  * Fixed the missing PASTE_SELECTION_SHORTCUT on macOS.
  * Fixed inconsistent-missing-override warnings.
  * Scrollable and compact Settings dialog.
  * C++11 code updates.
  * Fix View  Toggle Bookmarks.
  * Consider settings dialog frame on fitting it into screen.
  * Fixed the duplicated setHistorySize() call.
  * Create actions for switching to tab by index.
  * Allow to disable drawing line chars.
  * Made the initial terminal size consistent with qterminal.ui.
  * Fixed building qterminal.app on macOS.
  * No more incorrectly setting icon via OSC 1.
  * Allow fixed custom size for QTerminal.
  * Made menubar accelerators optional.
  * Added "Hide Window Borders" to context menu.
  * Remember the size of preferences dialog.
  * Fixed the version comparison.
  * Removed some debug outputs.
  * Removed the deprecated QFileDialog method `setConfirmOverwrite()`.
  * config: add a tooltip about box-drawing chars.
  * Implemented an action that allows you to send the history to your editor.
  * Added an option for borderless state and remembered it.

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