2.1.28, initiation update to PXT v5.28.24 (#54)

libs/core/pxtcore.h

@@ -0,0 +1,24 @@
+#ifndef __PXTCORE_H
+#define __PXTCORE_H
+
+#include "MicroBit.h"
+#include "MicroBitImage.h"
+#include "ManagedString.h"
+#include "ManagedType.h"
+
+namespace pxt {
+void debuglog(const char *format, ...);
+}
+
+// #define GC_GET_HEAP_SIZE() device_heap_size(0)
+#define xmalloc malloc
+#define xfree free
+
+#define GC_MAX_ALLOC_SIZE 9000
+
+#define GC_BLOCK_SIZE 256
+#define NON_GC_HEAP_RESERVATION 1024
+
+#define DMESG NOLOG
+
+#endif