For hotkeys, changed HotkeyManager to allow to get and make partial groups of hotkeys.
Also preserved the old configuration naming scheme for the ini, this is done to preserve compatibility with the older groups structure.
Add the ability to get GCPad control groups
Used like the HotkeyManager methods, this is used for the new GCPad configuration dialog.
Add the ability to get groups of Keyboard input
Same reasons as the previous ones.
Add ability to get groups of Wiimote input
Add the ability to get extensions group
This needed to pass to 3 classes. Will be used for their respective dialogs.
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