Widget type for entry in GUIs.
Cache entry values are always strings, but CMake GUIs present widgets to help users set values. The GUIs use this property as a hint to determine the widget type. Valid TYPE values are:
BOOL = Boolean ON/OFF value. PATH = Path to a directory. FILEPATH = Path to a file. STRING = Generic string value. INTERNAL = Do not present in GUI at all. STATIC = Value managed by CMake, do not change. UNINITIALIZED = Type not yet specified.
Generally the TYPE of a cache entry should be set by the command which creates it (set, option, find_library, etc.).