Avoid generating extra formatted copies when no action specific copyFormatting is set

[tusharsnx]

Avoid generating extra formatted copies when action's copyFormatting is not present and globally set copyFormatting is used.

Previously, when the action's copyFormatting wasn't set we deferred the decision of which formats needed to be copied to the TerminalPage::CopyToClipboard handler. This meant we needed to copy the text in all the available formats and pass it to the handler to copy the required formats after querying the global copyFormatting.

To avoid making extra copies, we'll store the global copyFormatting in TerminalSettings and pass it down to TermControl. If ControlCore::CopySelectionToClipboard() doesn't receive action specific copyFormatting, it will fall back to the global one before generating the texts.

Validation Steps Performed

• no copyFormatting set for the copy action: Copies formats according to the global copyFormatting.
• copyFormatting is set for the copy action: Copies formats according to the action's copyFormatting.

[DHowett]

thanks for doing this!