Removed the unecessary forced tabbed layout, removed the layout part of the constructor and remade some method in preparation for tabbed styled input dialog such as the new hotkey configuration one.  It breaks every inputconfigDialog, but this will get fixed in the next commits.

Also moved to a folder since there will be many more files created in the next commits so it gives better separation.

Slight redesign of Control Configuration sub-window since SL_LABELS can't be
used with DolphinSlider.

Add relative input for the Wiimote IR

Fix dialog closing buttons

This adds a recenter control binding which allows recentering the
cursor when relative input is enabled.

(EnableSettingControl is renamed to avoid confusions.)

This makes the GUI show the settings that are loaded when the config
gets reloaded, instead of showing potentially outdated settings that
are not applied.

This changes InputConfigDiag to disable the Dead Zone field in the IR
group when relative input is disabled.

This adds an option to enable relative input for the Wiimote IR
as described in issue 9014.

Enabling it will result in the pointer not going back to the centre
and the inputs will control the direction, not the absolute position.

Also adds a Dead Zone setting which is really needed when relative
input is enabled to prevent the cursor from slowly drifting on
most controllers. (Note: the Deadzone setting has no effect when
relative input is disabled)

The original code assumed that we would always find a button in
control_buttons. However, this is incorrect, since the iterator can and
will be control_buttons.end() if the button that triggered the iterate
code is not in control_buttons, which happens when it's in an
exclude list.