Shu Wang

Looks like someone keeps updating backward-cpp conan recipe now. We could update the badge to version 1.5 and set the link to conan center. https://github.com/conan-io/conan-center-index/tree/master/recipes/backward-cpp https://conan.io/center/backward-cpp/1.5/?user=_&channel=_

Dropdown/Guake/Visor/hotkey terminal feature

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**Is your feature request related to a problem? Please describe.** The so-called "**dropdown**" terminal window can be activated or deactivated by a single keystroke. Many terminal emulators have integrated this...