Support shortcut for starting `manimgl` interactively based on current line

[Splines]

Such a command (with an assignable shortcut) could do the following

Steps

• Launch a new terminal in a floating window
• Execute manimgl with params based on the which line the cursor is in, that is
  • Find out in which file the cursor is (probably easy), e.g. path/to/file.py based on the current directory where VSCode is open
  • Find out in which python class the cursor is (probably a lot trickier, maybe pylance provides kind of an API for this?), e.g. SceneName
  • Find out the current line number (probably easy), e.g. 42
  • Pass everything as mangiml path/to/file.py SceneName -se 42

Additional

• Before doing all of this, check if there isn't already a terminal open. If there is none open, do the steps above.
• If there is already a terminal open: somehow check if manimgl was already launched in interactive mode (in any of the open terminals).
  • If yes: is there a way to restart it on a new line number? For this case, it is maybe easier to just kill the active session and open a new one. However, this would have the disadvantage that the window position of the OpenGL popup is lost.
  • If no: just start it as described above.
  • Special case: what if multiple terminals run manimgl? Should probably report an error in this case.

[VladimirFokow]

implemented here

[bhoov]

Argh, I would really like to have this functionality as part of the extension before I publish this extension's awesome recent developments (thanks you both!) to the marketplace. However, after doing some research the CC-BY-NC-SA license is not compatible with the MIT license I am currently using. We have two options:

1. We can implement our own logic from scratch, without inspiration from the original implementation. Or,
2. We can update the extension's license to CC-BY-NC-SA

I believe this is a very important feature to have as part of the extension. Let me know your thoughts

[VladimirFokow]

Hi! Really awesome contributions from @Splines !

I believe Grant has allowed to use the workflow itself without the CC license.

[bhoov]

Oh sick. Let's get this functionality implemented then. Do you want to prep the PR against main?

[VladimirFokow]

Yes: #17