Export result of Version comparison in Excel format

[shytikov]

There is a need to add functionality exporting results of version comparison to file for further analysis.

But it's a huge question in which format export should be done: XML, JSON grouped by items among environments or, XML, JSON grouped by environment with all items.

CSV, maybe?

However resolution might be easier and more user-friendly. Export should be done in Excel format, and bring all this colorful coding, that is visible on UI.