* ESP32: Add option to set IP/dns config
This commit adds support for setting:
* Hostname
* Static IP / Dns server (Sta mode)
* Changing AP network ip config
* Setting DNS server IP for DHCP
* ESP32: Documentation for setting IP/dns/hostname config
* Documented new functions
* sethostname() now returns true if success
- Switched hardcoded interrupts to new IDF interrupt allocation
framework.
- gpio module switched to the IDF's per-pin interrupt callback service.
- Improved NodeMCU linker script since it broke with the IDF upgrade.
- Various compatibility updates.
WiFi STA module updated to reflect IDF name changes.
Platform flash and partition api updated to reflect IDF name changes.
Eventually these (and the SPIFFS module) will likely need to be updated
to exclusively work with the esp_partition_xxx() functions in order to
support working with encrypted flash.