Beta v1.3.3 "Gen5 Update"

Changes:

- New icons: browser, installer, uninstaller, html file.
- When you click on the link in the sidebar, the panel will close.
- "Key binds" renamed to "Hotkeys".
- New shortcut for hotkeys (Ctrl + Shift + H).
- Firmware update (Electron 5, Chrome 73, Node 12).

Added:

- Added Fullscreen HTML API.
- Added background for keys in the hotkeys window.

Removed:

- Removed support for all file types except .html and .htm.

Fixes:

- Repaired fullscreen mode.
- Fixed update notification.