<Ctrl>+<Tab> to change tab in dialogs

<Tab> and <Shift>+<Tab> change the focus between the objects of a dialog in KiCad and in almost all software.
A improvement (see Firefox, LibreOffice, and other commons softwares) is using <Ctrl>+<Tab> and <Ctrl>+<Shift>+<Tab> to change the focus between the tabs in a dialog. See the "Footprint Properties", "Pad Properties" in Pcbnew, "Library Symbol Properties" in "Symbol Editor", "Footprint Generators" in "Footprint Editor"...

Application: Pcbnew
Version: 6.0.0-unknown-20800d0~86~ubuntu16.04.1, release build
Libraries:
    wxWidgets 3.0.2
    libcurl/7.47.0 OpenSSL/1.0.2g zlib/1.2.8 libidn/1.32 librtmp/2.3
Platform: Linux 4.4.0-148-generic x86_64, 64 bit, Little endian, wxGTK
Build Info:
    wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
    Boost: 1.58.0
    OpenCASCADE Community Edition: 6.8.0
    Curl: 7.47.0
    Compiler: GCC 5.4.0 with C++ ABI 1009

Build settings:
    USE_WX_GRAPHICS_CONTEXT=OFF
    USE_WX_OVERLAY=OFF
    KICAD_SCRIPTING=ON
    KICAD_SCRIPTING_MODULES=ON
    KICAD_SCRIPTING_PYTHON3=OFF
    KICAD_SCRIPTING_WXPYTHON=ON
    KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
    KICAD_SCRIPTING_ACTION_MENU=ON
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_USE_OCC=OFF
    KICAD_SPICE=ON