Poor man's volume profile

This is an attempt to get something more or less similar to the volume profile for free.

The code is generated using a template. To change the settings, you may need to regenerate the code. The code has a link to the repository with the template.

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• Decouple width of history and recent profiles
  
• Make profile value independent from profile height
  

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More precise profile value calculation

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Fix width with disabled history/last profiles

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• Fix width with disabled history/last profiles
  
• Do not clip recent profile
  

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• Fix server study error by adding max_bars_back.
  
• Rewrite code to make it simpler but slower.
  
• Add option to use custom ticker as volume source.
  

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Fix "screenshot"

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Replace green color by teal

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Add volume point of control (VPoC) as a line

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• Use nz() instead of own nan_to_float()
  
• Fix history block offset
  

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Volume clusters (those called historical blocks) have been moved to a separate study, see "Poor man's volume clusters".

Study has been significantly optimized. Now you can set the profile size up to 500 bars (limit can be lifted if you change max_bars_back in the source code).

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Correct way (I'm sure of it) to calculate row value. It could be wrong.

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Fix preview chart

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Fix the calculation of the first bar.

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Highlight peak volume in a profile

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Maybe fix for profile disappearing

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Draw a profile using labels

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* Fix "Invalid symbol" warning when the custom volume source is enabled.