Welcome to the forum!
You can use the Quick Reply at the bottom of the message thread, to avoid the smileys. Although if you need attachments or other formatting options, you still need to go to the full editor.
Yes, Inkscape's coordinate system is different from the internet or browsers (and probably different from other graphics programs, although I couldn't say which). I seem to recall some talk about flipping it around, and there's a possibility it's already available in the development version. But I don't know that for a fact - it just Might be. I'm pretty sure the development version can be found here, but I couldn't tell you which file is the right one. Although it sounds like you might understand developer-ese, and maybe you can figure it out.
https://ci.appveyor.com/project/inkscape/inkscape/history If not, someone else should be along shortly, who can tell you which file to try. In fact, they can probably even say whether the flipped coordinate system is even availabe in a dev version yet.
Do I understand correctly that you want a single path for the text, rather than the outline of the text? For that you would need to use Hershey Text. Extensions menu > Render > Hershey Text (don't ask me why they didn't put it in the Text submenu
) However, I'm not sure if it offers the specific font that you're using.
There's another hershey text extension which produces more than just one line at a time. I don't know if it offers more fonts.
https://github.com/HardRainbow/Hardy-Hershey-Text Oh, and there's another. It provides a few different tools for lasers, which includes Hershey Text, but like the others, I've never used it or looked at it, so I don't know if it will provide what you need or not. I don't know if it even works with the current version of Inkscape. But just in case it might.
https://github.com/KnoxMakers/KM-LaserDo you need instructions for installing extensions?
For the extra SVG/XML code, you could try saving as Plain SVG, rather than Inkscape SVG. File menu > Save As. As far as I understand, it removes the XML which is specific to Inkscape.
I can't give you an answer about the licensing in the code. I don't think that code is giving the document any particular license, because you can assign whatever license you want to your work. (File menu > Document Properties > License)
Hhmm, when you say "xmlns" does that mean the namespace? I didn't even realize the namespace was related to the license. Although I've heard "namespace" talked about, just looking at a quick test file, I don't see any "namespace" in the XML Editor.
Well, clearly, you know XML much better than I do! Just one more new thing to learn about, right?! Someone else should be along before too long, who can give you more info about that.
Oh! If you don't like GUIs, Inkscape can be used from the commandline. Maybe you would be more comfortable with that?? Here's a reference if you're interested.
https://inkscape.org/en/doc/inkscape-man.html