implement word wrap in text node

src/util.cpp

@@ -544,23 +544,6 @@ glm::vec3 convert_rgb2hsv(const glm::vec3 c)
     return glm::vec3(fabs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
 }
 
-std::vector<std::string> split(const std::string& subject, char d, int max_split/* = 0*/)
-{
-    std::vector<std::string> ret;
-    size_t start = 0;
-    size_t n = subject.find_first_of(d);
-    while (n != std::string::npos)
-    {
-        ret.push_back(subject.substr(start, n - start));
-        start = n + 1;
-        if (max_split && ret.size() == max_split)
-            break;
-        n = subject.find_first_of(d, start);
-    }
-    ret.push_back(subject.substr(start));
-    return ret;
-}
-
 std::string unescape(const std::string& s)
 {
     std::string res;