tester: split simple call tests in two suites: video calls and other calls and minor files reorganization

Application needs to set
[net]
allow_late_ice=1

mk-ca-bundle.pl: die if no certs have been processed (currently happening due to mozilla website maintenance)

Using utf8 conversions, meaning converting back to Windows format on Windows
with ConvertFromUtf8Filename in sqlite3bctbx_Open.
Windows using win32  sqlite VFS methods for everything except open, read, write, close , sync, file control,
device characteristics, file size and lock related methods. Some of them are just stubs, refer to
source code.

tester: use H264 codec when using mire webcam because VP8 does not handle Mire properly, leading to failed tests on iOS

Even after creating the nat_policy, the settings of the firewall_policy
could still be used resulting in unexpected behavior.