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.

* first draft

* refine placeholder logic

bug: inputting and deleting a char on a widget quickly (i think at cursor blink speed) hold the input visually for that blink duration.

needs testing: placeholder specific attrs

* fix conflict with #73

* update placeholder attrs

* small fixes

* fix cursor showing on empty readonly widgets

---------

Co-authored-by: StaffEngineer <velo.app1@gmail.com>

* text cursor hover example

* move cursor modify fns to src

caveats:
 - only hides cursor when typing if cursor is in app window
 - only acts on primary window

* add config for cursor changes

cursor hide does not work on WASM

* Update src/cursor.rs

Co-authored-by: StaffEngineer <111751109+StaffEngineer@users.noreply.github.com>

* fix focus handling in cursor.rs

* Update src/lib.rs

Co-authored-by: StaffEngineer <111751109+StaffEngineer@users.noreply.github.com>

* add none | events | default options for cursor

* stop sprites sending hover events per frame

* commit missed example

---------

Co-authored-by: StaffEngineer <111751109+StaffEngineer@users.noreply.github.com>

should allow a user to install and use the plugin without needing their own install of cosmic-text

the violet color changed slightly when i set all the colors to bevy colors >.<

also break all tests and examples whoooops