[Process] Process Execution Refactor (#2632)

* Swap execute output method

* Create "Process" class and move random string to Strings

* test

* Tweaks

common/process/process.h

@@ -0,0 +1,19 @@
+#ifndef EQEMU_PROCESS_H
+#define EQEMU_PROCESS_H
+
+#include "../strings.h"
+
+#include <cstdio>
+
+#if _WIN32
+#define popen _popen
+#define pclose _pclose
+#endif
+
+class Process {
+public:
+	static std::string execute(const std::string &cmd);
+};
+
+
+#endif //EQEMU_PROCESS_H