Explicitly define vector type

Author: alandefreitas

source/matplot/util/world_cities.cpp

@@ -851,7 +851,7 @@ namespace matplot {
         auto x_line = x;
         auto y_line = y;
         auto names_line = names;
-        for (int i = pos_to_remove.size() - 1; i >= 0; --i) {
+        for (size_t i = pos_to_remove.size() - 1; i >= 0; --i) {
             x_line.erase(x_line.begin() + pos_to_remove[i]);
             y_line.erase(y_line.begin() + pos_to_remove[i]);
             names_line.erase(names_line.begin() + pos_to_remove[i]);

source/matplot/util/world_map_10m.cpp

@@ -829478,7 +829478,7 @@ std::numeric_limits<double>::quiet_NaN(),
 -84.35279604099992,
 -84.352796000999945,
         };
-        return std::make_pair(std::vector(std::begin(x), std::end(x)), std::vector(std::begin(y), std::end(y)));
+        return std::make_pair(std::vector<double>(std::begin(x), std::end(x)), std::vector<double>(std::begin(y), std::end(y)));
 	}
 
     std::pair<std::vector<double>, std::vector<double>>& world_map_10m() {

source/matplot/util/world_map_110m.cpp

@@ -10528,7 +10528,7 @@ namespace matplot {
                 -84.472517999202552,
                 -84.71338
         };
-        return std::make_pair(std::vector(std::begin(x), std::end(x)), std::vector(std::begin(y), std::end(y)));
+        return std::make_pair(std::vector<double>(std::begin(x), std::end(x)), std::vector<double>(std::begin(y), std::end(y)));
 	}
 
     std::pair<std::vector<double>, std::vector<double>>& world_map_110m() {

source/matplot/util/world_map_50m.cpp

@@ -123703,7 +123703,7 @@ std::numeric_limits<double>::quiet_NaN(),
 -84.268359375000017,
 -84.3515625,
 };
-        return std::make_pair(std::vector(std::begin(x), std::end(x)), std::vector(std::begin(y), std::end(y)));
+        return std::make_pair(std::vector<double>(std::begin(x), std::end(x)), std::vector<double>(std::begin(y), std::end(y)));
 	}
 
     std::pair<std::vector<double>, std::vector<double>>& world_map_50m() {