Position Size Calculator w/ profit targets

This script helps the user visualize profit targets and calculates position size based on the input risk amount.

Input variables:
- Risk amount
- Entry price
- Stop loss amount
- Profit target amount

Calculated variables:
- Profit loss ratio
- Position size
- Postion cost

Plotted variables:
- shaded: entry price --> price target (green filled)
- shaded: entry price --> stop loss target (red filled)
- 1:1 p/l ratio --> yellow line
- 2:1, 3:1, 4:1 p/l ratios --> green lines

Overlay text can be toggled on/off in parameter input section