Changes in branch ESP32-v3.0 (disable/enable BLE and Wifi)

Bluetooth on ESP32 eats a lot of memory. Only 2500 JsVars are available with Bluetooth and Wifi.
Just pushed a version to branch ESP-v3.0 with new commands to bypass this problem for those that need more memory instead of BLE or Wifi :

• ESP32.enableBLE(false/true) , adds about 1900 additional JsVars
  
• ESP32.enableWifi/false/true) , adds about 3800 additional JsVars
  
• ESP32.getState() , flags are added for BLE/Wifi status
  
  

Default is BLE and Wifi are enbaled.
If you don't need one of them in your application:

• type command to disable (argument = false)
  
• this status is saved in NVS (special storage area of ESP32)
  
• any saved source is deleted. This needs to be done to avoid overflow in JsVars
  
• ESP32 board performs a restart
  
• during restart status in NVS is checked, and based on that available RAM for JsVars is calculated
  From now on, the board starts according to enabled/disabled protocols.
  To go back to original, you can flash all memory, or use the ESP32.enable-functions with true.
  
  

To get this function running, a new mode for allocationg memory for JsVars is added. Please see ESP32.py in boards directory.

@Gordon, could you please take a closer look to changes in jsvar.h and jsvar.c
@wilberforce, I've never had the problem with hot chips, could you please check with your boards