Updates for crypto-bigint v0.7.0-rc.27

[tarcieri]

Release PR: RustCrypto/crypto-bigint#1204

Includes updates for the following breaking changes:

• Renamed nlimbs! => nlimbs (i.e. macro replaced with const fn)
• Renamed UnsignedMontyForm => UnsignedWithMontyForm
• Concat/ConcatMixed merged; Split/SplitMixed replaced with Split/SplitEven
• Use crypto_bigint::cpubits macro (re-export from cpubits crate) for 32-vs-64-bit selection

Also includes a bump to rand/rand_core v0.10

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.71%. Comparing base (d51e90f) to head (ac38024).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #114   +/-   ##
=======================================
  Coverage   98.71%   98.71%           
=======================================
  Files          14       14           
  Lines        1874     1874           
=======================================
  Hits         1850     1850           
  Misses         24       24           

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[tarcieri]

Perhaps we can get RustCrypto/crypto-bigint#1191 in with this too /cc @andrewwhitehead

[tarcieri]

Alright, that should be everything, and I went ahead and squashed.

[tarcieri]

This little bit is unfortunately a viral property of the cpubits crate. It allows the selection to be overridden using e.g. --cfg cpubits="64", and in order for that to work any crate which uses the cpubits! macro needs this configured (and it needs to include 16 since the macro emits it as an option, even though selecting 16-bits for crypto-bigint will cause a compile error)

[tarcieri]

@fjarri awesome, thank you!