Fix #1340: Long HTTP Chunks

Due to a copy/paste error, the start of the payload in the latest parsed
chunk was compared to chunk-length of the terminating chunk (5 chars).
So only chunks were parsed as expected, which also had a single hex
digit length.

This test would have caught #1340: handling chunks longer than 15 chars

Update FREERTOS + LWIP support

allow for in-url colon, when port is not specified