tSIP softphone: TLS and SRTP

Support for TLS and SRTP was added in tSIP 0.2.5. This adds requirement for libcrypto-1_1.dll and libssl-1_1.dll and indirectly Visual Studio 2015 runtime (required by OpenSSL dlls). Surprisingly this does not break compatibility with Wine and for Lubuntu 18 VC++ runtime was already present.

New configuration elements:

OpenSSL executable might be useful for debugging any certificate problems:

openssl s_client -showcerts -verify 5 -connect iptel.org:5061

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