feat: add capture sketch, Vidor image tool and jitter analysis script

arduino/strix_capture/fpga_image.cpp

@@ -0,0 +1,13 @@
+// STRIX FPGA image, written to the FPGA's flash by the Vidor bootloader after upload.
+// bitstream.h and signature.h are generated by `devbox run image`.
+#include <VidorBoot.h>
+
+__attribute__((used, section(".fpga_bitstream_signature")))
+const unsigned char fpga_signature[4096] = {
+#include "signature.h"
+};
+
+__attribute__((used, section(".fpga_bitstream")))
+const unsigned char fpga_bitstream[] = {
+#include "bitstream.h"
+};