Linter does not understand namespaces

[StephenWeatherford]

For this:

param p1 string = concat('a', 'b')

the linter suggests using interpolation instead of concat

But it gives no warning for this, which is equivalent:

param p1 string = sys.concat('a', 'b')

See comments from Marcin: #2341 (comment)

[StephenWeatherford]

Recommend post-0.4 because:

1. Seems to be an issue of false negatives, not false positives
2. There are currently no overlaps between namespaces

[StephenWeatherford]

Also affects checks against "newguid"

[StephenWeatherford]

This is done correctly in some rules but needs to be made consistent and have better re-usable code.