1.3.2 - Fix for a media server running on an Orange France router

Minor code change to allow chunked file/stream data which was reported by an user of an Orange France router. The device seems to be a Livebox from SoftAtHome. The media server is reported as "DMS V1.6.55".

1.3.1 - New function + example, minor bugfix

New function getServerCapabilities() actively queries a media server for it's UPnP content search/sort capabilities.
New example GetServerCapabilities_WiFi.ino makes use of it and log file GetServerCapabilities_WiFi_2-Warning.log shows the capabilities of a few real world media servers.
Bugfix in file SoapESP32.cpp, lines 986-988. Previous versions forgot to close the socket in this very rare error situation.

1.3.0 - New function sends UPnP content search requests

New function searchServer() available for sending UPnP content search requests to media servers (only useful if their ContentDirectory service can handle them). Existing functions seekServer() and getServerCount() now return 'unsigned int'. Some minor changes. More examples.

1.2.1 - Examples added/updated, build_opt.h added, Readme updated

All examples/sketches updated, 2 examples added, log file added, ArduinoIDE build option file 'build_opt.h' added to each sketch directory, platformio.ini and Readme.md updated.

1.1.6 - Minor changes

In file "DownloadFileExample1_WiFi.ino", line 40: udp client object removed. It's not needed for this example (no SSDP/UDP search).
In file "SoapESP32.cpp", line 115: check member variable != NULL to prevent possible runtime error.

1.1.5 - Improvement in soapPost() & successful tests with media server Mezzmo

Minor improvement in soapPost(): using malloc() instead of static buffer allocation. Warning message in SoapESP32.cpp, line 975 improved. Successful tests with media server Mezzmo.

1.1.4 - Minor changes, successful tests with MinimServer & QNAP-DLNA-Server

Compatibility tests with MinimServer on Windows & Standard QNAP-DLNA-Server under QTS 5.0.0.xxxx were successful. Minor change in SoapESP32.cpp, line 628: log_w() -> log_i(). New logs in folder Doc.