verilog: Add code style categorization

Implement code style categorization (comment/string/code) for Verilog.

src/highlighting.c

@@ -1550,6 +1550,9 @@ gboolean highlighting_is_string_style(gint lexer, gint style)
 			return (style == SCE_COFFEESCRIPT_CHARACTER ||
 				style == SCE_COFFEESCRIPT_STRING ||
 				style == SCE_COFFEESCRIPT_STRINGEOL);
+
+		case SCLEX_VERILOG:
+			return (style == SCE_V_STRING);
 	}
 	return FALSE;
 }
@@ -1715,6 +1718,12 @@ gboolean highlighting_is_comment_style(gint lexer, gint style)
 			return (style == SCE_COFFEESCRIPT_COMMENTLINE ||
 				style == SCE_COFFEESCRIPT_COMMENTBLOCK ||
 				style == SCE_COFFEESCRIPT_VERBOSE_REGEX_COMMENT);
+
+		case SCLEX_VERILOG:
+			return (style == SCE_V_COMMENT ||
+				style == SCE_V_COMMENTLINE ||
+				style == SCE_V_COMMENTLINEBANG ||
+				style == SCE_V_COMMENT_WORD);
 	}
 	return FALSE;
 }
@@ -1744,6 +1753,12 @@ gboolean highlighting_is_code_style(gint lexer, gint style)
 				return FALSE;
 			break;
 		}
+		case SCLEX_VERILOG:
+		{
+			if (style == SCE_V_PREPROCESSOR)
+				return FALSE;
+			break;
+		}
 	}
 	return !(highlighting_is_comment_style(lexer, style) ||
 		highlighting_is_string_style(lexer, style));