Add Ely.by accounts (#17)

* Initial Ely.by support

* Fix profile pictures for Ely.by

* Disable upload and delete skin buttons for Ely.by accounts

* Port UltimMC's authlib injector to PollyMC

launcher/minecraft/auth/flows/Elyby.cpp

@@ -0,0 +1,24 @@
+#include "Elyby.h"
+
+#include "minecraft/auth/steps/ElybyStep.h"
+#include "minecraft/auth/steps/ElybyProfileStep.h"
+#include "minecraft/auth/steps/GetSkinStep.h"
+
+ElybyRefresh::ElybyRefresh(
+    AccountData *data,
+    QObject *parent
+) : AuthFlow(data, parent) {
+    m_steps.append(new ElybyStep(m_data, QString()));
+    m_steps.append(new ElybyProfileStep(m_data));
+    m_steps.append(new GetSkinStep(m_data));
+}
+
+ElybyLogin::ElybyLogin(
+    AccountData *data,
+    QString password,
+    QObject *parent
+): AuthFlow(data, parent), m_password(password) {
+    m_steps.append(new ElybyStep(m_data, m_password));
+    m_steps.append(new ElybyProfileStep(m_data));
+    m_steps.append(new GetSkinStep(m_data));
+}