Added new VB keywords

Added new VB keywords; all from addhandler to xor are official keywords
of the current VB.NET; those from attribute to unload are legacy
keywords (VB6 etc.); those from aggregate to yiels are not reserved but
still have a special meaning in most cases

Closes #2496

PowerEditor/src/langs.model.xml

@@ -236,7 +236,7 @@
         <Language name="tex" ext="tex" commentLine="%">
         </Language>
         <Language name="vb" ext="vb vbs" commentLine="&apos;" commentStart="" commentEnd="">
-            <Keywords name="instre1">addhandler addressof andalso alias and ansi as assembly attribute auto begin boolean byref byte byval call case catch cbool cbyte cchar cdate cdec cdbl char cint class clng cobj compare const continue cshort csng cstr ctype currency date decimal declare default delegate dim do double each else elseif end enum erase error event exit explicit false finally for friend function get gettype global gosub goto handles if implement implements imports in inherits integer interface is let lib like load long loop lset me mid mod module mustinherit mustoverride mybase myclass namespace new next not nothing notinheritable notoverridable object on option optional or orelse overloads overridable overrides paramarray preserve private property protected public raiseevent readonly redim rem removehandler rset resume return select set shadows shared short single static step stop string structure sub synclock then throw to true try type typeof unload unicode until variant wend when while with withevents writeonly xor</Keywords>
+            <Keywords name="instre1">addhandler addressof alias and andalso as boolean by byref byte byval call case catch cbool cbyte cchar cdate cdbl cdec char cint class clng cobj const continue csbyte cshort csng cstr ctype cuint culng cushort date decimal declare default delegate dim directcast do double each else elseif end endif enum erase error event exit false finally for friend function get gettype global gosub goto handles if implements imports in inherits integer interface is isnot let lib like long loop me mod module mustinherit mustoverride mybase myclass namespace narrowing new next not nothing notinheritable notoverridable object of on operator option optional or orelse out overloads overridable overrides paramarray partial private property protected public raiseevent readonly redim rem removehandler resume return sbyte select set shadows shared short single static step stop strict string structure sub synclock then throw to true try trycast typeof uinteger ulong ushort using variant wend when while widening with withevents writeonly xor attribute begin currency implement load lset rset type unload aggregate ansi assembly async auto await binary compare custom distinct equals explicit from group into isfalse istrue iterator join key mid off order preserve skip take text unicode until where yield</Keywords>
         </Language>
         <Language name="verilog" ext="v sv vh svh" commentLine="//" commentStart="/*" commentEnd="*/">
             <Keywords name="instre1">always and assign attribute begin buf bufif0 bufif1 case casex casez cmos deassign default defparam disable edge else end endattribute endcase endfunction endmodule endprimitive endspecify endtable endtask event for force forever fork function highz0 highz1 if ifnone initial inout input integer join medium module large localparam macromodule nand negedge nmos nor not notif0 notif1 or output parameter pmos posedge primitive pull0 pull1 pulldown pullup rcmos real realtime reg release repeat rnmos rpmos rtran rtranif0 rtranif1 scalared signed small specify specparam strength strong0 strong1 supply0 supply1 table task time tran tranif0 tranif1 tri tri0 tri1 triand trior trireg unsigned vectored wait wand weak0 weak1 while wire wor xnor xor alias always_comb always_ff always_latch assert assume automatic before bind bins binsof break constraint context continue cover cross design dist do expect export extends extern final first_match foreach forkjoin iff ignore_bins illegal_bins import incdir include inside instance intersect join_any join_none liblist library matches modport new noshowcancelled null packed priority protected pulsestyle_onevent pulsestyle_ondetect pure rand randc randcase randsequence ref return showcancelled solve tagged this throughout timeprecision timeunit unique unique0 use wait_order wildcard with within class clocking config generate covergroup interface package program property sequence endclass endclocking endconfig endgenerate endgroup endinterface endpackage endprogram endproperty endsequence bit byte cell chandle const coverpoint enum genvar int local logic longint shortint shortreal static string struct super type typedef union var virtual void</Keywords>