ADD: Add "Backend.Config.envExpand()" to resolve environment variable strings.

- ADD: Add "Backend.Config.envExpand()" to resolve environment variable strings (e.g. resolving "{%ProgramData}" to "C:\ProgramData").
Merge branch 'master' into python2.7

- ADD: Add "Backend.Config.envExpand()" to resolve environment variable strings (e.g. resolving "{%ProgramData}" to "C:\ProgramData").