Mostly cleaning code a bit - #15

Proposed changes to NTP_Server

• 53fa221: ntp_packet_t.precision is a signed byte and usually negative.
• 138f945: can't imagine processUDPPacket() would ever need to be called from outside the NTP_Server.
• 725ae69: removing the initial byte order swaps of the timestamps that get overwritten later.

Compilation error in platform-espressif32 v 6.3.1

• c23def7: compiler throwing error when comparing 0 to deserializeJson in line 443
• all the other changes are fluff; my editor automatically removed trailing spaces. Sorry about that.

Thank you very much for NTP_Server, it is very useful.