Add winerror.h constants
Add definitions and fix usage of COLOR_xxx constants, LoadCursor()
Fix typo
Handle case when the script is on a mapped network drive

When we launch pythonw.exe as admin, we apparently no longer have our mapped drives. As a result, pythonw isn’t able to locate the script unless it’s in UNC notation
Merge branch 'master' of https://github.com/nickhutchinson/elevate

* 'master' of https://github.com/nickhutchinson/elevate:
  Create README.md