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Option types
[XLV Plugin Option API]

Defines
#define	XLV_PLUGIN_OPTION_UINT8   0
	option is an 8 bits integer.
#define	XLV_PLUGIN_OPTION_UINT16   1
	option is a 16 bits integer.
#define	XLV_PLUGIN_OPTION_UINT32   2
	option is a 32 bits integer.
#define	XLV_PLUGIN_OPTION_STRING   3
	option is a string.
#define	XLV_PLUGIN_OPTION_CHOOSEONE   4
	option is a single choose options described by m_option_substree.
#define	XLV_PLUGIN_OPTION_CHOOSEMULTI   5
	option is a multiple choose options described by m_option_substree.
#define	XLV_PLUGIN_OPTION_GROUP   6
	this is a group of options. Options are described in m_option_subtree.
#define	XLV_PLUGIN_OPTION_BOOL   7
	option is a boolean.

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