Fix loop to be more accuratly timed, and added custom ruby libs inclusion setup

src/main.cc

@@ -1,6 +1,7 @@
 #include "binding/definitions.h"
 
 int main(int argc, char *argv[]) {
+  Ruby::load_mgems();
   definitions::setup();
 
   char *startup_script = nullptr;

src/window/window.cc

@@ -451,14 +451,17 @@ const char *Window::paste() {
 }
 
 uint64_t Window::get_time() {
-  return SDL_GetTicks();
+  return SDL_GetTicksNS();
 }
 
 uint64_t Window::delta_time() {
   static uint64_t last_time = 0;
-  uint64_t current_time = SDL_GetTicks();
+  static bool first_call = 1;
+  uint64_t current_time = SDL_GetTicksNS();
   uint64_t delta = current_time - last_time;
   last_time = current_time;
+  if (first_call)
+    return (first_call = 0);
   return delta;
 }