Post Composer

[orual]

From morpho-app created by neema-orual: Radiant-Industries/morpho-app#8

Yeah, this is kind of an important component.

[orual]

First version of this works. Text only, should do replies and quote posts.

Doesn't quite dodge the keyboard correctly.

[orual]

The refactor I did when I added images seems to have messed up quote posts. Replies may be working ok now, though.

[orual]

Ok, it was mostly an oversight in the main timeline composer UI flow. But did some cleanup anyway.