ENH: Added progress reporting to Masked FFT NCC

Added progress reporting to the
itkMaskedFFTNormalizedCorrelationImageFilter. The progress reporting
is calculated based on the progress of the FFT and IFFT computations,
which are the most computationally expensive steps of the algorithm.
There are 12 FFT/IFFT computations in the algorithm.

This patch address JIRA ticket: ITK-3099

Change-Id: Icd6af337f15ae359ec5bf1ab5fe84200a0575ff2
Merge topic 'MaskedFFTProgressReporting'

f471f3d ENH: Added progress reporting to Masked FFT NCC