refactor(simu): use SDL & ImGui (#6233)

Co-authored-by: raphaelcoeffic <1050031+raphaelcoeffic@users.noreply.github.com>
Co-authored-by: Malte Langermann <malte@langermann.net>

radio/src/os/timer_pthread.cpp

@@ -4,6 +4,8 @@
 
 #include <algorithm>
 
+using namespace std::chrono_literals;
+
 static timer_queue* _instance = nullptr;
 static std::mutex _instance_mut;