Facilitate copy & paste of richtext/html

[seltzered]

Please mark as dupe if this isn't somewhere already, I haven't seen it written in the other issues in detail.

• Athens should facilitate good copy/paste - particularly in cases of copying text that has links and some degree of text formatting (italics, bold, etc.).

I haven't seen this enumerated enough but would like to explain my current user workflow issues - these currently cause me to use Athens less or go through various hacks:

Current state (observed using commit 1f1eeec - 2021-01-25)

Copying into Athens:

1. Copy long message I initially wrote elsewhere (website, another app, etc) into Athens, which has bold text and a number of links
2. Observe the links and bold text gets stripped. Go back to using another tool.
   (Propose copying into Athens to feel similar to any other app if possible)

Pasting out of Athens:

1. Copy message out of Athens, paste into another tool
2. Observe everything is in it's current form is markdown. Fine. Open yet another tool (e.g. Macdown, Marked, Pandoc/Panwriter, etc.) to render markdown, then copy it.
   I can live with copying in markdown as the default, but propose a right-click block option to copy as rich text. Ideally it's vice versa - a user can copy as rich text by default and that doesn't wreck a workflow where one is copy/pasting back into Athens (i.e. copy/paste of something like an image again means links get deduped).

I realize there's likely some complexity dependencies that make this a longer-term feature, just wanted to write down thoughts for discussion.