Import CSV

[shadowmax31]

Add a way to import CSV files from:

• crypto.com
• Shakepay

The goal is to import multiple CSV files and call the right transactions (buy, sell or exchange).

• [x] To import one file after another we need to be able to create transactions in any order (see #3 for more details).
• [x] Import Shakepay
• [x] Import crypto.com
• [x] Automatically find what type of CSV the application is reading (Shakepay or Crypto.com)
• [x] We also need to be able to import the same file (or a different file with the same transactions) multiple times without creating the same transaction twice. This is useful for Shakepay where we cannot export the transactions by dates. Meaning that every time we import the CSV, we are going to have old transactions that are already in our database. To identify identical transactions, we could use the DateTime and amount of the transaction. The DateTime could be enough too, because one person is not going to make two transactions at the exact same second.
• [x] Make sure the undo and export functions still work
• [x] Add unit tests

[shadowmax31]

The function will be called generate instead of import. This will simply echo text to the terminal. This is how it should be used:

crypto generate file.csv > ~/gen
~/gen

This makes it so it does not break the export and undo functions