migrate code to AS7, including fucked up arduino import

arduino as a library will not build with -flto. I can't figure it out. so we
waste some space compared to what platformio was building. oh well. there's
still over 1K of space left for programs.

fw/HackSpaceCon_AS7/Arduino/megatinycore/new

@@ -0,0 +1,5 @@
+/*
+this header is for compatibility with standard c++ header names
+so that #include<new> works as expected
+*/
+#include "new.h"