Fix .pck lookup for extensionless binary names with a dot

This was not a problem on Windows as binary names are guaranteed to end
with '.exe', but on Unix systems binary extensions are purely cosmetic
and thus optional, which is a problem when using `get_basename()` to
lookup a potential '.pck' file, as it can fail on e.g. "My Game 2.0" (#15188).

To fix this, ProjectSettings::setup now checks for both basename + '.pck'
and filename + '.pck'.

Fixes #15188, supersedes and closes #22755.

Also took the opportunity to improve documentation on this core method.

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