Parse and render emoji reactions

[benwaffle]

Fixes part of #152

TODO:

• handle the default tapback reactions like "Loved" and "Emphasized"
• we should scan all messages for emoji reactions during the DB migration to migrate existing users on app update
• multiple emojis from a specific sender should overwrite each other, i.e. only count the latest
• "👎 2" wraps
• show reaction messages if target message not found
• the thread summary on the main screen still shows the emoji reaction message (not really a problem)

To keep this PR simple, I've left out:

• when long-pressing on the emoji, a popup should come up listing which contact sent each emoji
• notifications (untested) i think notifs are fine, it just shows the reaction message text which is user friendly already (e.g. Bob Smith reacted 🔥 to "this is lit")
• sending emoji reactions

[Inhishonor]

Looks good! I haven't tested too extensively yet, so there might be more once I do that.

[benwaffle]

The emojis are getting clipped off at the bottom (it's easier to see in light mode). If anyone here's good at android layout, I'd love some help.

[benwaffle]

@Inhishonor the regexes should be localizable now. it's in i18next json format, supported by weblate. it's gonna be annoying/not recommended to edit via weblate because of the invisible unicode characters. but at least it'll show us which translations are missing

[benwaffle]

maybe we should just use the same regexes as google messages? although i don't think it handles iOS non-english reactions. Will have to check tomorrow.

"(?s)^(Loved|Liked|Disliked|Laughed\\sat|Emphasi[zs]ed|Questioned)\\s\\“(.*)\\”\\Z";
"(?s)^Removed\\s(?:a|an)\\s(heart|like|dislike|laugh|exclamation|exclamation\\smark|question\\smark)\\sfrom\\s\\“(.*)\\”\\Z"
"(?s)^\\\u200a[^\\\u200b\\\u200a]*\\\u200b([^\\\u200b]*)\\\u200b[^\\\u200b\\\u200a]*\\\u200a(.*)\\\u200a[^\\\u200b\\\u200a]*\\\u200a\\Z"
"(?s)^\\\u200a[^\\\u200c\\\u200a]*\\\u200c([^\\\u200c]*)\\\u200c[^\\\u200c\\\u200a]*\\\u200a(.*)\\\u200a[^\\\u200c\\\u200a]*\\\u200a\\Z"

[Inhishonor]

Looks good, just a few formatting errors.

[Inhishonor]

For handling newlines in message content.

[Inhishonor]

The suggested change prevents placeholder messages from being scanned,

Outdated

[Inhishonor]

There will probably be things as soon as we merge, but I think it is good. Thanks very much!