QmlProfiler: Rename Label to CategoryLabel

This is to avoid confusion with generic Label
Quick component.

Change-Id: I6a72266c394862706215b6db40bcd3592f9d24b3
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Revert "QmlProfiler: Rename Label to CategoryLabel"

This patch should go to 3.0
This reverts commit aa624b9defb205acf10b535f7bbb187e5a52785c

Change-Id: I5efed4110275d25b5bf21d8894de441e5f715dbe
Reviewed-by: Aurindam Jana <aurindam.jana@digia.com>