Add regular RegExp Unicode property escape tests (#1014)

...ty-escapes/generated/General_Category_-_Line_Separator.js

...-escapes/generated/General_Category_-_Lowercase_Letter.js

...Exp/property-escapes/generated/General_Category_-_Mark.js

...perty-escapes/generated/General_Category_-_Math_Symbol.js

...y-escapes/generated/General_Category_-_Modifier_Letter.js

...y-escapes/generated/General_Category_-_Modifier_Symbol.js

...y-escapes/generated/General_Category_-_Nonspacing_Mark.js

...p/property-escapes/generated/General_Category_-_Number.js

...-escapes/generated/General_Category_-_Open_Punctuation.js

...xp/property-escapes/generated/General_Category_-_Other.js

...erty-escapes/generated/General_Category_-_Other_Letter.js

...erty-escapes/generated/General_Category_-_Other_Number.js

...escapes/generated/General_Category_-_Other_Punctuation.js

...erty-escapes/generated/General_Category_-_Other_Symbol.js

...capes/generated/General_Category_-_Paragraph_Separator.js

...perty-escapes/generated/General_Category_-_Private_Use.js

...perty-escapes/generated/General_Category_-_Punctuation.js

...roperty-escapes/generated/General_Category_-_Separator.js

...y-escapes/generated/General_Category_-_Space_Separator.js

...erty-escapes/generated/General_Category_-_Spacing_Mark.js