Improve warning message of issues in qmldir files

When there is an error in a qmldir file, the warning message typically looks like this:

somewhere/main.qml:9:1: a component declaration requires two or three arguments, but 4 were provided

Problems

• The message does not indicate that the problem is within a qmldir file.
• The message does not indicate which line of the qmldir file is having the problem.

Suggestions

• Include the arguments in the message. Since it already detects that there is something wrong with the arguments, it would be reasonable to include the arguments in the message.
• If possible: include the path (and line) of the affected qmldir file in the message.