My_Portfolio

Displays all time high/low/mean prices and average cost with lines; and the price changes relative to the average cost in percentages.
This does not calculate average cost. This is just a fast way of viewing the current situation of one's portfolio.
Parities invested in and average costs for them have to be manually entered in the settings or by editing the script.
Should work with all parities.

Versionshinweise:

Switch to using switch statement instead of nested if statement.

Versionshinweise:

Made the code more readable, and the settings window prettier.