fixing mouseover and hover behavior

fix: closes #17 for real this time

fix: hopefully fix issue #17, causing weird reset speeds

feat: hide with controls timer for non-youtube websites, site-specific rules for it too

fixed import/export and saving settings

feat: Import/Export settings
feat: Site-specific rules in settings
feat: add setting to hide controller with YouTube controls, restoring what I viewed as a bug
fix: z-index regression causing the controller to show above certain modals, fullscreen top padding for certain sites
fix: General settings UI updates
fix: In add shortcut, it only shows unused/unadded shortcuts
fix: Change the shortcuts from a dropdown to just a text box
fix: replaced default disabled websites with example domains
fix: Shows preferences pane in the Addon Manager
chore: Cleaned up text, cleared up colors
refactor: probably other stuff but I forgot

Added a new shortcut, P, to move the controller from top left to top middle, etc, clockwise
Fixed Hover controls not working on Youtube
Restored Sites on which extension is Disabled functionality
Using querySelectorAll instead of recursively calling scanNodeForMedia on every element in the DOM
Hijacking Youtube's native playback speed controller for some performance gain, at least up to 2.0, and afterwards, use the nudging mechanism

fix: separated controller from youtubes autohide

feat(nudge): add per-tab toggle, status badge, and cpu tuning

Changed the addon's name

fix(firefox): it liked to complain

fix(detection+reliability): better at recognizing oddly sourced videos, better at not losing track of its speed, better at hiding properly, redid keyboard shortcut mechanism for more stability, added a version number to the settings and menu, hopefully fixed bugs surrounding skipping/pausing resetting the speed

General Performance improvements

Fixed rounding, and background speed drift

Fixed CPU usage, using requestAnimationFrame for GPU Usage instead.

Much better recognition of videos, improved DOM handling

Dark Mode

Fixed high background CPU Usage due to nudge feature