ENGINES: Improve output of unknown game variant detection

When a user tries to add a game expecting it to be a particular
game for a particular engine, but a detector from another engine
happens to match some files that exist in the game directory and
reports on those files instead, this can cause a lot of confusion
because the detector doesn't say what engine or game it thought it
matched.

This patch adds the name of the matching engine as well as any
matching game IDs (if applicable) to the detector's logged output.
It also provides more specific guidance about where to send the
detection information (to the bug tracker), and properly wraps the
first part of the report to 80 columns.

Refs Trac#10272.

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