RSI with BB and MAs

This indicator is based on the 'rsi sma/ema CU' indicator by auroagwei. That is a great base to start with.
I've added Bollinger Bands, crossover indications and alert conditions to it, to work with a combined RSI - MA - BB strategy.

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Cleanup

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Wrongly named bands. Needs to be 'Volatility Bands'.

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Typo

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Added optional overbought/oversold signal only checkbox, So there will only be a cross on the RSI if overbought/oversold and outside the bands.

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Upgraded to Pine 5
Add extra alert for when the RSI crosses up again over the bottom of the volatility band

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Small change to the plotting of the bottom cross

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Bugfix in crossing conditions