Merge pull request #2202 from monarchdodra/swapPointsTo

reinsert doesPointTo in swap/move
Fix issue 12828: Fix return type of SimpleTimeZone.utcOffset.
Merge pull request #2219 from jmdavis/datetime

Fix issue 12828: Fix return type of SimpleTimeZone.utcOffset.
Remove now-unneeded workaround for bug# 4866.
Fix functions which are supposed to return by ref in SysTime.

Compiler bugs previously prevented these functions from returning by
ref.
Fix functions which are supposed to return by ref in Date.

Compiler bugs previously prevented these functions from returning by
ref.
Merge pull request #2217 from tom-tan/trusted-stdio-LockingTextWriter-ctor-dtor-postblt

Mark std.stdio.LockingTextWriter.this, ~this and this(this) as @trusted
Fix issue 3363: std.stream.readf segfaults with immutabel format strings
Merge pull request #2222 from jmdavis/datetime

Remove workarounds for some compiler bugs which were fixed
Make std.stdio.LockingTextWriter.put and lockingTextWriter @safe
More ref return fixes in std.datetime now that the compiler allows them.
Merge pull request #2227 from jmdavis/datetime

More ref return fixes in std.datetime now that the compiler allows them.
Supplemental fix for issue 12857

The local template function zeroLen is inferred to @system. So it should not be placed directly under the @safe unittest body.
Merge pull request #2229 from 9rnsr/fix12857

Supplemental fix for issue 12857
add byCodeunit, byChar, byWchar and byDchar to std.utf
Merge pull request #2188 from Kapps/fix12771

Fix issue 12771 - Variant opIndex for static arrays is not implemented.
Update to git head.
Merge totalcontainer.d with package.d
Fix #12806

Documentation improvement for `std.traits.isArray` to clarify whether
associative arrays are handled.

Fixes #12806
Reuse codepoint sets for identical character classes

These are very common and blowup memory usage at CTFE (that has no TLS
cache for that).
In any case it makes for slightly more compact memory footprint,
so a net gain regardless.