Add better error handling for situation where destination path cannot be
created, for all project types. Also report back the Windows error
message which hopefully clarifies why the directory could not be
created.
Fixes: #14348
Fixes: KEYMAN-DEVELOPER-1P1
Fixes: KEYMAN-DEVELOPER-2SN
Test-bot: skip
Fixes#10138.
If the current instance of Keyman Developer already has a project open,
then the New Project dialog will now open the new project in a new
instance of Keyman Developer.
Note: this also moves a couple of functions out of dmActionsMain and
into UfrmMain, as their functionality belongs more closely there. The
`TmodActionsMain.OpenProject` function has been renamed to
`TfrmMain.OpenProjectInCurrentProcess` to clarify its usage and context.
Fixes#9869.
Adds a 'Description' field, tweaks Copyright strings, and tweaks
default content for documentation to the New Project wizards and
kmconvert.
