Removed a few *LPxxx types that are not supposed to be there (in
particular LPICONINFO).
Added a few missing *LPCxxx types (MENUITEMINFO, SCROLLINFO,
DLGITEMTEMPLATE).
WINHELP and PE_ACCEL are internal types.
MULTIKEYHELP and HELPWININFO both have an A and W variant.
NUMBERFMT, CURRENCYFMT and the related API belong to winnls.h.
Added missing ARW_xxx defines (for sysmetrics).