sutterspeed 0.4.2

Windows viewer and firmware 0.4.2.

• sutterspeed-viewer.exe: the viewer (no install), with the firmware inside. Plug in the board and pick its COM port.
• sutterspeed.hex: the whole flash image (USB bootloader + firmware), the same one that is inside the viewer.

Changes since 0.4.1

• Trigger: turning the time base into the roll range (20 ms/div and slower) still switches the trigger off, but turning back to 10 ms/div or faster now switches it on again, in the mode it had (AUTO / NORMAL / SINGLE). Switched off by hand, it stays off.
• Firmware: version number only.