Improve external popup menu appearance about uivonim HOT 5 OPEN

One more thing: the popup menu doesn't seem to be respecting Pmenu colors.

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One more thing: in the TUI, completion text is aligned with the input text. It would be nice if the popup could do the same in uivonim.

Actual:

Expected:

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@romgrk Should be fixed in 6aee29e, although I'm not sure about how that ends up looking for smaller window sizes.

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One more thing: the popup menu doesn't seem to be respecting Pmenu colors.

This is actually a broader issue due to uivonim kind of doing it's own thing for the colors of external UI elements. I'll see if I can get a PR that fixes this for everything, not just the pmenu.

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* [x]  In the TUI, word and menu are printed in separate columns; would be nice to have this for the external menu as well.

* [x]  Menu only shows a subset of entries but does not scroll if end is reached.

* [ ]  Single-character completion items are shown as numbers (their ASCII char codes) instead

* [ ]  Support base64-encoded images in Markdown for the documentation window

* [ ]  Re-enable word-wrapping for multi-line pum (`menu`) entries, with consistent alignment of all cells (either centered or -- better? -- top-aligned)

@clason I think (3) is no longer an issue now that we use node-client, (4) I need a test case for but would theoretically be pretty straightforward to add; also need a test case for that last one if you wouldn't mind, and mind elaborating a bit on what exactly you mean with that one too? Been a while since I worked on the pmenu-related code so don't really remember what that one's about 😅

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