Rename scrcpy threads

Prefix the name of threads by "scrcpy-". This improves readability in
the output of `top -H` for example.

Limit the thread names to 16 bytes, because it is limited on some
platforms.

app/src/util/process.c

@@ -64,7 +64,7 @@ sc_process_observer_init(struct sc_process_observer *observer, sc_pid pid,
     observer->listener_userdata = listener_userdata;
     observer->terminated = false;
 
-    ok = sc_thread_create(&observer->thread, run_observer, "process_observer",
+    ok = sc_thread_create(&observer->thread, run_observer, "scrcpy-proc",
                           observer);
     if (!ok) {
         sc_cond_destroy(&observer->cond_terminated);

app/src/util/thread.c

@@ -8,6 +8,10 @@
 bool
 sc_thread_create(sc_thread *thread, sc_thread_fn fn, const char *name,
                  void *userdata) {
+    // The thread name length is limited on some systems. Never use a name
+    // longer than 16 bytes (including the final '\0')
+    assert(strlen(name) <= 15);
+
     SDL_Thread *sdl_thread = SDL_CreateThread(fn, name, userdata);
     if (!sdl_thread) {
         LOG_OOM();