[Web] Keystroke control path rework

[Web] Deprecation fixes.

Mac compatibility with legacy apps

Added/enhanced comments related to showPreferences workaround.

Added comment to explain the use of the regex to find a base character to use as the start of the string inserted using the insertText method.

Update history.md for macOS on alpha to match beta

Mac high sierra config workaround

Fixed typo

WIP: This is what I have tried so far. The config window does NOT display when accessed via the menu. It still works (the old/right way) in Sierra when accessed via the About window. If you first try to access it via the menu and then access it via the Configuration button on the About window, it displays twice!

Automatically load images based on screen scale

Fix keyboard menu popup view width