Moved button thread to its own file (#1260)

* Moved button thread to its own file

* Move some debug code blocks into their own files

* Shutdown refactoring

* Removed GENIEBLOCKS

src/debug/i2cScan.h

@@ -0,0 +1,44 @@
+#include "../configuration.h"
+#include "../main.h"
+#include <Wire.h>
+
+#ifndef NO_WIRE
+void scanI2Cdevice(void)
+{
+    byte err, addr;
+    int nDevices = 0;
+    for (addr = 1; addr < 127; addr++) {
+        Wire.beginTransmission(addr);
+        err = Wire.endTransmission();
+        if (err == 0) {
+            DEBUG_MSG("I2C device found at address 0x%x\n", addr);
+
+            nDevices++;
+
+            if (addr == SSD1306_ADDRESS) {
+                screen_found = addr;
+                DEBUG_MSG("ssd1306 display found\n");
+            }
+            if (addr == ST7567_ADDRESS) {
+                screen_found = addr;
+                DEBUG_MSG("st7567 display found\n");
+            }
+#ifdef AXP192_SLAVE_ADDRESS
+            if (addr == AXP192_SLAVE_ADDRESS) {
+                axp192_found = true;
+                DEBUG_MSG("axp192 PMU found\n");
+            }
+#endif
+        } else if (err == 4) {
+            DEBUG_MSG("Unknow error at address 0x%x\n", addr);
+        }
+    }
+
+    if (nDevices == 0)
+        DEBUG_MSG("No I2C devices found\n");
+    else
+        DEBUG_MSG("done\n");
+}
+#else
+void scanI2Cdevice(void) {}
+#endif