* Feature: Control a LED Illuminator or Flash from Camera_Web_Server
Add a "LED Illuminator" menu to menuconfig
Through menuconfig you can select a LEDC pin, LEDC Timer, LEDC Channel, and LEDC Speed Mode
The defaults work for the AIThinker ESPCAM-32 board
There is an option to limit LED intensity while streaming to prevent overheating
LED intensity is not limited when taking a still image photo
The LED intensity controls are hidden on the web page if the LED feature is not enabled
LED intensity can be adjusted while streaming and the LED will respond right away
Tested on an ESPCAM-32 board with an OV2460 sensor
* app_httpd.c: move isStreaming into macro
* app_httpd.c: Change commit re: 150ms LED delay
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