fixed: FindAddons() needs calling before calling GetDeps() - caused dependencies to not install on addon install

These patches were applied but the patches themselves were not put in
the ffmpeg patches/ directory.

[WIN32] changed: use a shell script for the mingw dlls and call it from the batch file. more flexible and working better.

[WIN32] added: batch file to compile mingw libs (for inclusion in the automated build process). Still not working right. Sometimes it builds through sometimes not. need to figure out why.

[WIN32] changed: copy dll to the right location. bootstrap doesn't work anymore. Dunno how it worked ever (despite what I'm stated)

[WIN32] check if we are called from within the ffmpeg directory. fixed: copy dlls to the right place.

[WIN32] fixed ffmpeg compilation by removing libfaad. Please provide a patch if anyone wants to have it back.

The default output format for json (responses and announcements) has been changed to a compact print.
This can be disabled (pretty print) by setting <jsonrpc><compactjson>false</compactjson></jsonrpc> in advancedsettings.xml.

Now that hdhomerun isn't polluting our namespace we don't need to mask
the errors it was causing.

libhdhomerun is nice enough to define min and max macros for us in one
of its global headers.  Unfortunately they already reside in the std
namespace so conflicts arise, resulting in compile errors.  We can limit
the polution to the hdhomerun dll interface by breaking it away from the
VFS implementation sources.