Added support for empty size modifier in DfuSeFormat

[Standa-R]

Some STM32 MCUs, e.g., the STM32L07x family, omit the size modifier in their alternate strings. This improves the Regex to account for that and adjusts the following logic, see fix #20 for more details.

[Copilot]

Pull request overview

Updates DFUSe alternate-setting string parsing to handle STM32 devices that omit the size modifier (K/M/space) in memory layout descriptors, addressing issue #20.

Changes:

• Relaxed the DFUSe memory layout regex to allow an empty size modifier.
• Updated parsing logic to safely handle a missing size modifier without indexing into an empty string.

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[benedekkupper]

Thanks for the PR! Two small things to fix in the commit message:

1. Remove the second half of the title, where the "added testing" expression is misleading, and overall that part isn't necessary.
2. Add a Signed-off-by to the bottom of the commit message (there is built-in support for adding it in all git tools). This is a new requirement for all commits, you are the first to be tripped by it.

[Standa-R]

I am a bit lost in these waters, learned about amend, and Signed-off-by. I probably made a mistake, as I see a new commit instead of the previous one being edited, and I am going to attempt to fix that.

[Standa-R]

Ah, ok, easier than I thought. Thanks for the advice and the opportunity to learn new things.

[benedekkupper]

Thanks for your contribution! I will publish a new release with your fix in the coming weeks.