Relative Strength Index w/ 3 Levels & 0 Line Colour (by WJ)

NOTE:
// RSI CODE TAKEN FROM DEFAULT INDICATOR
// I HAVE ONLY MADE SOME ADJUSTMENTS FOR VISUAL AID
// I MADE THIS FOR MY OWN USE BUT HAVE DECIDED TO PUBLISH AND SHARE IN CASE ANYBODY WANTS TO USE IT

This is the normal default built-in RSI indicator which I have added some stuff for visual aid:

• Added middle line (50)
  
• RSI turns green when crossed above 50
  
• RSI turns red when crossed below 50
  

• RSI background turns green and red on crossover candle based on whether RSI just crossed over or below 50 respectively
  
• Alert notification on the crossover candle
  

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Shifted comments in code

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Fixed 0 Line to 50 Line text

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Added SMA in RSI

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Changed default settings for SMA on RSI from 227 to 88 as it works better personally

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- Changed some default colours and added a 90/10 OB/OS alert

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- Issue of Upper and Lower Bands changed limits not affecting RSI colour change should be fixed
- Alerts for mid line crossover and OB/OS levels should be dynamic now

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- Changed RSI back to 14 as default value
- Added 2 more bands because I need them :d

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- Removed extra bands
- Added MA choices and ability to turn it off

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Updated some stuff