Store IR code commands locally on SPIFFs and transmit by simplified json

[dham1012]

Stored codes can be sent by simplified json command (no need to copy the code or raw data to sending services (IFTTT etc). e.g. http://xxx.xxx.xxx.xxx:80/json?btn[1]. Where 1 is the stored button name.

The same command URL (bar IR controller IP) can be used across multiple IR Controllers (assuming the same stored IR command name is used)