Initial commit of cbt scripts

[smlambert]

Initial commit of change-based testing scripts that generate lists of files that have changed between all tags or between 2 tags in an upstream repository and compare the file names against test target strings to output a recommendation as to whether a target should be run or could be excluded/ignored.

Note: purposefully keeping a copy of output in the tags folder at present, as results can be referenced without running scripts and tags content aids in faster processing when running in the future.