Merge branch 'GPII-581'

* GPII-581: (22 commits)
  GPII-581: Removed console.log for SPI, added fluid.log for process waiting
  GPII-581: Tidy up of waitForSpi
  GPII-581: Tidy up of waitForProcessState Made options immutable, renamed waitForProcessStateChange to waitForProcessState
  GPII-581: Removed redundant waitForTask() Replaced with windows.waitForProcessStart()
  GPII-581: Created waitForProcessStateChange function, and waitForProcessTermination/Start wrappers. Provides the ability to wait for a process to start or end.
  GPII-581: Removed assertion of the waitfor process being closed on demand. For some reason it was unable to send the signal, but it's ok because it will die after a few seconds. Not going to fail the test just because waitfor didn't work.
  GPII-581: Made the API test asynchronous (and work). The promise returned from 'set' is no longer synchronous.
  GPII-581: Made the API test asynchronous. The promise returned from 'set' is no longer synchronous
  GPII-581: Fixed indentation.
  GPII-581: Added comment to waitForTask helper function.
  GPII-581: Removed some declarations that are no longer required. "WaitForSingleObject" and related constants.
  GPII-581: Added 'options' parameter to waitForProcessTermination And other tidy-ups
  GPII-581: Added comment for waitForSpi.
  GPII-581: Wait for sethc.exe to finish before calling SPI, too. Acceptance tests where still causing 2 instances of sethc.
  GPII-581: SPI High contrast detection no longer spawns a new process. Moved process related code into processHandling.js, updated kill tests to also make use of it.
  GPII-581: Created processHandling, and consumed killProcess. Putting process related functionality together
  GPII-581: Put WindowsUtilitiesCore.js back into WindowsUtilities.js No longer needs to be in a separate file.
  GPII-581: Environment variable not being set for child process Options for fork now added to instead of replaced
  GPII-581: Made SpiHighContrastCompletion.js more pleasant. Added background information, refactored convoluted loops and nesting into separate functions.
  GPII-581: Moved the win api definitions to WindowsUtilitiesCore.js Taken the ffi funciton definitions from WindowsUtilities.js into its own file, so they can be included by the child-process in SpiHighContrastCompletion.js without the need to load universal.
  ...

Author: amb26