Add new algorithm alias for cryptonight_v8_double. The difference to v8
is that the number of iterations is increased.

Add also the currency X-CASH which use cryptonight_double.

rebased version of #2261

Added support of CryptoNight v8 Reverse Waltz (named cryptonight_v8_reversewaltz here) - equal to CryptoNight v8 but with 3/4 iterations of CryptoNight v8 and with reversed shuffle operation

We plan to use CryptoNight v8 Reverse Waltz as new PoW algorithm for Graft (graft-project/GraftNetwork#234).

fix bfactor


fix

- add more information if a algorithm derives from an other
- update `pools.tpl`

This PR replaces #2196 and add support for zelerius.

- add cryptonight_v8_half
- re-add stellite and masari to the supported coins

- rename `Intense` to `Lethean`
- remove `masari` and `stellite`, both hase forked to a currently
unsupported algorithm

- reintroduce monero7 until the POW is final
- update docs (add cryptonigh_v8)

changed chose to choose

- add cryptonight_heavy derivate cryptonight_bittube2
- add coin bittube
- remove coin ipbc because this coin is now called bittube

- remove all cryptonight coins (algorithm cryptonight can still be used)
- update README.md

- add ryo currency
- update documentation

solve #1494

- add algorithm `cryptonight_v7_stellite` (internal named: `cryptonight_stellite`)

- add algorithm `cryptonight_lite_v7_xor`
- update documentation

- documentation: change `aeon` to `aeon7`
- change `case` order in `switch` statements
- update README.txt

the signatures for the next release will be in the release note itself

Co-authored-by: psychocrypt <psychocryptHPC@gmail.com>
Co-authored-by: fireice-uk <fireice-uk@users.noreply.github.com>
Co-authored-by: Lee Clagett <code@leeclagett.com>
Co-authored-by: curie-kief <curie-kief@users.noreply.github.com>

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Changed capitalization of "macOS"

Squashed the commit