add 'headers' argument to network.get, network.get_binary and network.post

src/network/Network.hpp

@@ -25,6 +25,7 @@ namespace network {
             const std::string& url,
             OnResponse onResponse,
             OnReject onReject=nullptr,
+            std::vector<std::string> headers = {},
             long maxSize=0
         ) = 0;
 
@@ -33,6 +34,7 @@ namespace network {
             const std::string& data,
             OnResponse onResponse,
             OnReject onReject=nullptr,
+            std::vector<std::string> headers = {},
             long maxSize=0
         ) = 0;
 
@@ -144,6 +146,7 @@ namespace network {
             const std::string& url,
             OnResponse onResponse,
             OnReject onReject = nullptr,
+            std::vector<std::string> headers = {},
             long maxSize=0
         );
 
@@ -152,6 +155,7 @@ namespace network {
             const std::string& fieldsData,
             OnResponse onResponse,
             OnReject onReject = nullptr,
+            std::vector<std::string> headers = {},
             long maxSize=0
         );