Add ability to override item images using meta (#12614)

src/util/string.cpp

@@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "hex.h"
 #include "porting.h"
 #include "translation.h"
+#include "strfnd.h"
 
 #include <algorithm>
 #include <array>
@@ -897,3 +898,15 @@ void safe_print_string(std::ostream &os, const std::string &str)
 	}
 	os.setf(flags);
 }
+
+
+v3f str_to_v3f(const std::string &str)
+{
+	v3f value;
+	Strfnd f(str);
+	f.next("(");
+	value.X = stof(f.next(","));
+	value.Y = stof(f.next(","));
+	value.Z = stof(f.next(")"));
+	return value;
+}

src/util/string.h

@@ -765,3 +765,11 @@ std::string sanitizeDirName(const std::string &str, const std::string &optional_
  * brackets (e.g. "a\x1eb" -> "a<1e>b").
  */
 void safe_print_string(std::ostream &os, const std::string &str);
+
+/**
+ * Parses a string of form `(1, 2, 3)` to a v3f
+ *
+ * @param str String
+ * @return
+ */
+v3f str_to_v3f(const std::string &str);