Inform about enabling the update mode on the device

[szszszsz]

Show this message on tool's start:

This tool allows to update Nitrokey Storage's firmware. Please select
<I>Configure -> Enable Firmware Update</I> in the Nitrokey App [2] and
download the .hex file of the latest firmware version[1].

[1] https://github.com/Nitrokey/nitrokey-storage-firmware/releases/latest
[2] https://www.nitrokey.com/download

[szszszsz]

Fixed with https://github.com/Nitrokey/nitrokey-update-tool/commit/e404bf232c40e65f228389b6c27e1a37fb95400c. Current screen shot:

[szszszsz]

Additionally tool's closing is not possible while the update procedure is running.

[jans23]

1. I tried the 0.4 release under Windows and the instructions are not displayed. Here is how it looks for me:
2. I suggest to remove the first four lines (NK Prod tool started... Source is available...) because it distracts users from reading the actual instructions (if displayed as desired)
3. Please change the text "Device connected in update mode: false" to "Nitrokey Storage detected. Please enable firmware update mode in Nitrokey App first."

[szszszsz]

Sorry for not directly mentioning - #1 fix will be released in v0.5 (v0.4 is not containing it). I will apply the rest of the suggestions.

[szszszsz]

Current view (will be released in v0.5):

[jans23]

Screenshot looks much better.

What does "see Links..." mean? I don't think it is clear to users where to look. Perhaps adding the link right there instead?

I suggest to replace bullet points with numbers (1, 2, 3, 4) to make it more clear that these are steps.

[szszszsz]

OK! Will be changed to numbers.

I have added a Links submenu to the application, whose items are opening the required URLs. I will add menu word to the description to indicate that better. If that would still not be obvious, I will add the URLs in the text as suggested.