Add remaining 1.6 release features

[cinnamon-msft]

The following items need to be documented on the release-1.6 branch:

• Remove preview labels from 1.5 features
• Add docs for double underscore cursor #153 Double underscore cursor - Add doubleUnderscore cursor style microsoft/terminal#7827
• Document startupActions global setting #217 Startup actions - Introduce startupActions in settings microsoft/terminal#8770
• Add docs for move-focus subcommand #209 move-focus subcommand - Add a move-focus subcommand microsoft/terminal#8546
• Add docs for size param of splitPane action #208 size parameter for splitPane and split-pane - Add size param to splitPane action, split-pane subcommand microsoft/terminal#8543
• Documentation for pixel shader changes #210 Custom pixel shaders - Implement user-specified pixel shaders, redux microsoft/terminal#8565
• Open settings UI command - Implement the Settings UI microsoft/terminal#8048
• Navigating panes by MRU - Support for navigating panes by MRU microsoft/terminal#8183
• scrollhome and scrollend actions - Add ScrollHome and ScrollEnd microsoft/terminal#8459
• Document commandLine launchMode for command palette #202 launchMode on commandPalette action - Add launchMode parameter to ToggleCommandPalette action microsoft/terminal#8382
• 8075: document --tabColor command line argument #185 tabColor parameter - Add support for setting tabColor on the command line microsoft/terminal#8102
• Tab switcher defaults to inOrder - Change the default tab switch mode back to inOrder microsoft/terminal#8326
• Bell style - Add a setting to flash the taskbar when the terminal emits BEL microsoft/terminal#8215
• Document moveTab command #198 MoveTab command - Teach Terminal to move tabs with key bindings microsoft/terminal#8338
• Ensure all links are updated and forward properly

[DHowett]

Many of these already have associated pull requests. Should we link them here?

[cinnamon-msft]

Yep! That’s my next step. :)