Keyboard Shortcuts: lay foundation for feature #5332
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Lay the foundation for a standard way to configure user defined keyboard shortcuts. Added "Shortcuts" settings tab which can write and retreive gtk accelerator-strings from core::control::Settings
Shortcut key-values are stored as a std::unordered_map.
I did not add any modification to ActionDatabase yet, and would like to get community feedback before.
(second commit because I forgot to clang-format)
Refrences issue #919