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/HSC_Wand/isr.cpp

@@ -0,0 +1,43 @@
+/*
+    hackspacecon wand firmware
+
+    interrupt routines
+
+*/
+
+#include <Arduino.h>
+
+#include "rgbled.h"
+
+extern uint8_t run_rgbprog;
+
+
+// TCB0 general interrupt
+ISR(TCB0_INT_vect)
+{
+    uint8_t intflags = TCB0.INTFLAGS;   
+
+    // in this program, this interrupt is only used for timing.
+    // we'll now return to executing loop()
+
+    // reset the INTFLAGS - necessary on this series
+    TCB0.INTFLAGS = intflags;
+}
+
+// button interrupt
+ISR(PORTA_PORT_vect)
+{
+    uint8_t intflags = PORTA.INTFLAGS;
+
+    // shitty debounce; this is bad practice
+    delay(5);
+
+	// was our pin changed?
+    if (intflags & PIN3_bm) {
+        // start or re-start running a program
+        run_rgbprog = 1;        // run a new program
+    }
+
+    // reset the INTFLAGS - necessary on this series
+    PORTA.INTFLAGS = intflags;
+}