Add Support for Australia about rp2 HOT 3 OPEN

Hi @eprbell, Australia's tax year is from 1st July to 30th June. I don't see any way to change the default behaviour of report generation (1st January to 31st December) through the exposed class methods. Any suggestions?

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There is nothing blocking you from sorting the data into years based on that calendar. RP2 gives you all the data by default and you can then sort that however you want. For example, in the tax report for Japan I sorted tax years like this:

# Sort all in and out transactions by year, the fee from intra transactions must be reported
for entry in chain(in_transaction_set, out_transaction_set, intra_transaction_set):  # type: ignore
  transaction: AbstractTransaction = cast(AbstractTransaction, entry)
  years_2_transaction_sets.setdefault(transaction.timestamp.year, []).append(entry)

I just used the timestamp year, but you could easily change that to filter the data however you want.

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What @macanudo527 is correct. I'll only add a couple of details:

1. there is one class in RP2 that computes yearly summaries (YearlyGainLoss). It has hard-coded year start at Jan 1st. However the generator plugins for Australia (or another country) can simply ignore it (and compute its own summaries, if needed, or no summaries).
2. tax year begin date could become a new method of country plugins
3. YearlyGainLoss could use the new tax year begin date method to adjust its computation.

Point 1 is available today. Points 2 and 3 could be done as an enhancement.

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