Concatenate video files subplot style

Concatenates videos to a single file. Handy for testing videos for differences.

This functions goal is to concatenate several videos together. This can be useful when one wishes to compare the videos among themselves. The easiest way to do so, it to watch them simultaneously. The user provides the input video files, and their ordering (number of columns and rows) in the fileNames cell array (also possible to choose files via Files Explorer). The functions builds the outVideo column-wise (so the user should arrange the inputs order according to his needs), and returns the outVideo (path and file name). The user can set the resulting video name and location via 'outVideo' input, otherwise it will be set automatically (location will be determined by first input
video). The number of frames of the resulting video will be determined by the shortest input file (the herd of buffalo rule). Videos can be synchronized in time using the frameShiftVec vector which is zero by default.