more improvements to setPixelColor #326

Job	Run time
Test cdata.js	51s
Gather Environments	15s
Build Enviornments (nodemcuv2)	2m 39s
Build Enviornments (esp8266_2m)	2m 27s
Build Enviornments (esp01_1m_full)	2m 18s
Build Enviornments (nodemcuv2_160)	2m 20s
Build Enviornments (esp8266_2m_160)	2m 16s
Build Enviornments (esp01_1m_full_160)	2m 24s
Build Enviornments (nodemcuv2_compat)	2m 18s
Build Enviornments (esp8266_2m_compat)	2m 25s
Build Enviornments (esp01_1m_full_compat)	2m 21s
Build Enviornments (esp32dev)	2m 4s
Build Enviornments (esp32_eth)	2m 3s
Build Enviornments (lolin_s2_mini)	2m 53s
Build Enviornments (esp32c3dev)	2m 24s
Build Enviornments (esp32s3dev_16MB_opi)	2m 36s
Build Enviornments (esp32s3dev_8MB_opi)	2m 58s
Build Enviornments (esp32s3_4M_qspi)	2m 58s
Build Enviornments (esp32_wrover)	2m 22s
Create Release	0s
	42m 52s

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