refactor + move rendering fns to own file

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

* implement copy/paste for wasm

* ignore wasm specific "dead" code

* fix ctrl instead of command on mac

* fix character input if clipboard shortcut held

* extract undo redo to own fn and refac

* fix first edit not being undoable

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

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

* implement copy/paste for wasm

* ignore wasm specific "dead" code

* fix ctrl instead of command on mac

* fix character input if clipboard shortcut held

* 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

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

* double + triple click detection

* working multi click selection

* refactor and split input fn

Input has been decoupled into input_mouse and input_kb

Moved `lib.rs` around, ordered as enums > structs > plugin > functions

* allow selection and copy on readonly buffers

* remove clicktimer

* fix clippy

* 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

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

* rewrite `draw_pixel`

causes overlayed text to appear correctly blended

Breaking Changes:
 - CosmicEdit*Bundle::background_color renamed to fill_color, and takes a new `FillColor(pub Color)`

* fix clippy

* Add text position Left

* Support infinite-line mode

* update readme

* update default mode name

* Add auto-height mode, refactoring

* Clippy

* Add text position Left

* Support infinite-line mode

* update readme

* update default mode name

* Add set_text workaround

* fix ci

fix ci

move click fns to userland

pause cursor blink on input