PasteUpload task changed to use 0x0.st's protocol

- Modified PasteUpload task to upload the log file to 0x0.st and other
  services with the same protocol.

- Modified Paste settings UI to allow the user to select a custom paste
  URL, simplified the settings page code.

launcher/net/PasteUpload.h

@@ -8,37 +8,21 @@ class PasteUpload : public Task
 {
     Q_OBJECT
 public:
-    PasteUpload(QWidget *window, QString text, QString key = "public");
+    PasteUpload(QWidget *window, QString text, QString url);
     virtual ~PasteUpload();
 
     QString pasteLink()
     {
         return m_pasteLink;
     }
-    QString pasteID()
-    {
-        return m_pasteID;
-    }
-    int maxSize()
-    {
-        // 2MB for paste.ee - public
-        if(m_key == "public")
-            return 1024*1024*2;
-        // 12MB for paste.ee - with actual key
-        return 1024*1024*12;
-    }
-    bool validateText();
 protected:
     virtual void executeTask();
 
 private:
-    bool parseResult(QJsonDocument doc);
-    QString m_error;
     QWidget *m_window;
-    QString m_pasteID;
     QString m_pasteLink;
-    QString m_key;
-    QByteArray m_jsonContent;
+    QString m_uploadUrl;
+    QByteArray m_text;
     std::shared_ptr<QNetworkReply> m_reply;
 public
 slots: