Merge pull request #657 from jmdavis/codeLength

Added codeLength which works with a full string.
Add std.uuid module
Refactor to float literals with ending 0
Added new overload for codeLength to changelog.
Added fix for issue# 8158 to changelog.
Merge pull request #626 from jkm/master

Fix issue 7948
Updated changelog for fix to issue# 7948.
Merge pull request #520 from NilsBossung/std.container.Array.replace

fix std.container.Array.replace
Merge pull request #553 from WebDrake/master

Rewrite of RandomSample to use Jeffrey Scott Vitter's Algorithm D.
Merge pull request #567 from denis-sh/signals-fixes

Signals fixes
Merge pull request #629 from donc/bigint8022div

Fix issue 8022 BigInt division bug (2)
Merge pull request #638 from xammy/eb46d99217f2bf1e6d173964e2954248b08146d6

Several BitArray improvements
Merge pull request #642 from donc/bigint7993div

Bigint7993div
Merge pull request #651 from jpf91/std.uuid2

Add std.uuid module
Merge pull request #656 from 9rnsr/fix8321

Issue 8321 - std.range.put doesn't work with RefCounted output range
Merge pull request #658 from 9rnsr/parameterTraits

Add ParameterIdentifierTuple and ParameterDefaultValueTuple.
Disable test for bug 8231 temporarily.
Fix wrong enforce in Zip's member popBack()
- Incorporate comments by andralex
Optimizations for startsWith and endsWith.