Add script 'get_dlibcurl32', to auto-create Win32 libcurl import lib.
get_dlibcurl32: Only download implib if not already installed.
Use std.regex.replaceAll instead of replace().

replace() is now deprecated and required the regex to be compiled with
specific flags; the new API uses replaceAll().
Refactor code to be unittestable.

I'm ashamed of the fact that I wrote this program with zero unittests!
Merge pull request #82 from quickfur/replaceAll

Use std.regex.replaceAll instead of replace().
get_dlibcurl32: Couple minor cleanups.
get_dlibcurl32: Add message directing user to output directory.
Merge pull request #79 from Abscissa/get_dlibcurl32

Add script 'get_dlibcurl32', to auto-create Win32 libcurl import lib.