Merge branch '4087_verilog_syntax_highlighting'
* 4087_verilog_syntax_highlighting:
verilog syntax: clarify that also refers to systemverilog,
verilog syntax: added some missing operators
verilog syntax: reorganized and added missing compiler directives
verilog syntax: reorganized and added missing system tasks and system functions
verilog syntax: added IEEE1800-2009 and 2012 missing keywords
verilog syntax: added IEEE1800-2005 missing keywords
verilog syntax: added IEEE1364-2005 missing keywords
verilog syntax: added IEEE1364-2001 missing keywords
verilog syntax: added missing ieee1364-1995 keywords
Ticket #4087: verilog syntax: removing keyboards attribute, endattribute, strength