dfinity / rust-dogecoin / 16411792700

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refactor(params): simpler and more consistent Dogecoin params (#12)

Changes to Dogecoin parameters, in preparation for DigiShield difficulty
adjustment PR https://github.com/dfinity/rust-dogecoin/pull/11:
- replace `struct Params` encapsulating `bitcoin_params` and
`dogecoin_params` into unified `Params` structure.
- change `timespan` and `pow_target_timespan` types from `u64` to `i64`.
The motivation is twofold: 1) [Dogecoin
core](https://github.com/dogecoin/dogecoin/blob/51cbc1fd5/src/consensus/params.h#L67)
is using `int64_t` type throughout, 2) manipulating negative `timespan`
is easier and safer to handle, which is going to be the case when
switching to DigiShield where difficulty adjustment interval is only 1
block.
- change `pow_target_spacing` type from `u64` to `i64` for consistency
with Dogecoin.

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