Merge with default

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branch : customkb
Remove conflict shortcuts of default setting

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branch : customkb
KeyCaptureLineEdit: accept all event.

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branch : customkb
MainWindow2: unload all shortcuts before showing Preference Windows, and load them back after closing Preference.

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branch : customkb
PencilSetting: add method for restore default shortcuts

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branch : customkb
ShortcutsPage: almost done

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branch : customkb
Disable c++11, MinGW does not support it.

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branch : customkb
fix missing connection

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branch : customkb
Pencil.pro: fix platform scope linux-g++ => unix
Merge with default

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branch : customkb
ShortcutsPage: beginGroup() is dangerous, use it only in local variable.

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branch : customkb
pencil.pro: use more general platform scope linux-*
Merge with default

--HG--
branch : customkb
ShortcutsPage: remove duplicated shortcuts when conflicts.

--HG--
branch : customkb
Merge with customkb