update roadmap

[plowsof]

closes #1937

had to combine the years/tabs to make room for 2022, only takes several minutes of copy and pasting , but has to be done once for each year (2023 is fast approaching)

Future section (up for discussion)

• OSPEAD
• LWS Subaddress support
• Bulletproofs++
• others...

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[erciccione]

Thanks @plowsof, an update is very needed :)

I want to point out that we always kept the roadmap as minimal as possible, with only major entries (except when we added some minor releases in past, but i think that was a mistake) and i think we should keep that structure to avoid this page to become too dense.

[rating89us]

"Monero <-> Bitcoin atomic swaps" item should link to https://www.getmonero.org/2021/08/20/atomic-swaps.html

[plowsof]

Thanks @rating89us xmr-btc atomic swap link added

[HardenedSteel]

Does bounties count for roadmap? If yes adding BCH <=> XMR atomic swaps would be great. Also decentralized Monero marketplace too.

[erciccione]

I would add only items that we know are being worked on or are at least planned. Otherwise the roadmap becomes a collection of features we wish to be added to Monero.