Basic support for emailing a report of a problem (#43).
Add verbatim quickmail.c from libquickmail 0.1.18.
Remove DLL export stuff and non-curl implementation.
Add verbatim quickmail.h from libquickmail 0.1.18.
Remove win32 DLL stuff.
Remove DLL export stuff.
Use in-tree libquickmail; send metadata.xml too; fix basic build errors with quickmail.
Add flag to prevent libcurl sendint VRFY on sending emails.
Fix quickmail warnings.
Merge branch '2.0' of ssh://main.carlh.net/home/carl/git/dcpomatic into 2.0