move files: main_vusb.c ps2_usart.c sendchar_usart.c from ps2_usb to common dir

vusb/sendchar_usart.c

@@ -0,0 +1,19 @@
+#include <stdint.h>
+#include "oddebug.h"
+#include "sendchar.h"
+
+
+#if DEBUG_LEVEL > 0
+/* from oddebug.c */
+int8_t sendchar(uint8_t c)
+{
+    while(!(ODDBG_USR & (1 << ODDBG_UDRE)));    /* wait for data register empty */
+    ODDBG_UDR = c;
+    return 1;
+}
+#else
+int8_t sendchar(uint8_t c)
+{
+    return 1;
+}
+#endif