3102 json lowercase hex (#4306)

* Made it possible to use lowercase hex numbers, also when encoding JSON (#3102)

Co-authored-by: Thomas Weyn <Thomas.Weyn@cebir.be>

* fix(JSONString): Remove deprecated toJSON functions #4305

* fix(NumericString): conversions inconsistencies #4304

---------

Co-authored-by: Archipel <thomas@weynwebworks.com>
Co-authored-by: Thomas Weyn <Thomas.Weyn@cebir.be>

JSON/include/Poco/JSON/Array.h

@@ -90,6 +90,12 @@ public:
 
 	bool getEscapeUnicode() const;
 		/// Returns the flag for escaping unicode.
+	
+	void setLowercaseHex(bool lowercaseHex);
+		/// Sets the flag for using lowercase hex numbers
+
+	bool getLowercaseHex() const;
+		/// Returns the flag for using lowercase hex numbers
 
 	ValueVec::const_iterator begin() const;
 		/// Returns the begin iterator for values.
@@ -206,6 +212,7 @@ private:
 	//  is because Array can be returned stringified from a Dynamic::Var:toString(),
 	//  so it must know whether to escape unicode or not.
 	bool             _escapeUnicode;
+	bool             _lowercaseHex;
 };
 
 
@@ -224,6 +231,17 @@ inline bool Array::getEscapeUnicode() const
 	return _escapeUnicode;
 }
 
+inline void Array::setLowercaseHex(bool lowercaseHex)
+{
+	_lowercaseHex = lowercaseHex;
+}
+
+
+inline bool Array::getLowercaseHex() const
+{
+	return _lowercaseHex;
+}
+
 
 inline Array::ValueVec::const_iterator Array::begin() const
 {