Use temporary files for the java checker

logic/JavaChecker.h

@@ -1,10 +1,12 @@
 #pragma once
 #include <QProcess>
 #include <QTimer>
+#include <QTemporaryFile>
 #include <memory>
 
 class JavaChecker;
 
+
 struct JavaCheckResult
 {
 	QString path;
@@ -31,6 +33,7 @@ signals:
 private:
 	QProcessPtr process;
 	QTimer killTimer;
+	QTemporaryFile checkerJar;
 public
 slots:
 	void timeout();