Move Utils.cobra methods to Cobra.Lang extensions

[Chuck]

There are several useful methods in the compiler's Utils.cobra. Move these as extension methods to Cobra.Lang\Extensions. Note that not all methods in Utils.cobra will be migrated. Only the highly general purpose ones.

[hopscc]

Heres the candidates identified as 'useful' from Utils

String.{capped,md5hashInHex}
  Move to String

Utils methods -> String extension methods
    countChars
    isCapped
    startsWithLowerLetter (-> startsIsLower)
    startsNonLower        (-> startsIsNonLower)

Utils.join(sep as String, parts*) -> join(parts*)
       join(sep,lastSep, parts*)    -> join(lastSep as String, parts*)
       join( sep as String, parts as vari String) - unused remove

The path adjusting methods should go to (static methods extending) Path class but cannot do that - leave in Utils, docstring and rename to path<*>...
    combinePaths -> pathCombine
    normalizePath-> pathNormalizeLeading
    forceExtension(fileName, extn) -> pathForceExtension(filename, extn)

 getS{B,I,S,O} - make generic version (getKeyValueOrDefault)

[hopscc]

the getS{B,I,S,O} family changes to
Utils.dictGetVOD<of T> - ( dictGetValueOrDefault)

[hopscc]

Heres a patch file for the above - relnote, tests inline with the methods.
You'll probably need to regen the Snapshot version to get this building correctly
but I expect you know all about that by now.

[Chuck]

Applied.