Add TesterDeposit and TesterWithdrawal methods

[lazou]

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This PR will add TesterDeposit and TesterWithdrawal methods for backtesting.

[eabase]

@lazou

You didn't say much about what this tester is to be used for. Back-testing you say, but... What exactly makes this function a "test", instead of actually doing it?

Perhaps you have a code/usage examples?

[lazou]

@eabase Thanks for your reply. Both methods are standard mt5 methods (see the used links) which are not yet available in mtapi. They can be used to add or withdraw deposit while backtesting. It is not meant to be a "test" or something else.