Edit-attention fixes

[missionfloyd]

Currently, if the cursor is inside parentheses or angle brackets that aren't an (emphasis:1.0) block, Ctrl+Up/Down does nothing.

Fixes it by using regular expressions to more accurately check if selected text is inside an emphasis block.

If selected text is inside (parentheses) or [square brackets], as with old-style emphasis blocks, they'll be ((added)) or removed accordingly, or optionally converted to (numeric:1.1).

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests

[SirVeggie]

Instead of adding more parenthesis ((thing)) around the word, maybe it could transform it into (thing:1.2) instead.

[AUTOMATIC1111]

this breaks if you attempt to edit b in (a:1.1) b (c:1.1)

[catboxanon]

test <lora:name:1> doesn't function correctly when attempting to edit test as well.

The behavior is even worse if it's separated by a newline like this. Increasing/decreasing the weight of test at least twice will clear everything that follows. Fixed by 464fbcd

test ... {a bunch more text here}
<lora:name:1>