* rework placeholders to use single editor

* add default placeholder color

* move placeholder systems out of main render

* explicit ordering for password/placeholder systems

unicode chars are buggy in this commit

i do not like the online merge conflict editor

adds bullet (U+2022) to font subset

replaces rendered text with bullets in password fields

- selection in password widgets is buggy

adds a `CosmicCanvas` component to hold the image cosmic draws to. allows easier interop between UI and Sprite widgets

Each type of widget now uses a single `CosmicEditBundle`, adding widget specific components with `.insert()` or as tuples.

Merged redraw and redraw_ui into a single function, in order to make placeholder and password code easier

Moved most of redraw_common into main redraw function, having type wrangling issues with the image replace function