Check for consistent VideoLineMaps

[philipnbbc]

#32 reminded that there are differences in VideoLineMap and the line numbers for 525-line were changed / fixed to be {20,283}. Check the bmx codebase to see if there are more inconsistencies that are not a result of a explicit choice by a manufacturer. E.g. VC2 has it set to {23, 285}, but there is a comment above saying it needs checking!

[thomasheritage]

Hi, thanks for your contribution.
Per #114 this repo is now being archived. You might wish to contribute to https://github.com/ebu/bmx instead (issues will be enabled on that repo shortly).