Add examples for edge cases of str.split/str.splitn

In particular, show examples for splitting the empty string and using `splitn`
with a count of 0.

Fix #14222.
docs: Add win64 calling convention
Remove allow(deprecated_owned_vector) lint
auto merge of #14335 : tbu-/rust/pr_doc_strsplit, r=pnkfelix

In particular, show examples for splitting the empty string and using `splitn`
with a count of 0.

Fix #14222.
auto merge of #14349 : richo/rust/docs/win64_calling_convention, r=alexcrichton

Wikipedia suggests that windows on x64 has it's own calling convention (Supported by the fact that we implement it)

source: http://en.wikipedia.org/wiki/X86_calling_conventions#x86-64_calling_conventions
auto merge of #14354 : EdorianDark/rust/master, r=huonw

It seemed to me, that [T] was deprecated and i am trying to help.
rustdoc: Fill in external trait methods

This commit alters rustdoc to crawl the metadata of upstream libraries in order
to fill in default methods for traits implemented in downstream crates. This,
for example, documents the `insert` function on hash maps.

This is a fairly lossy extraction from the metadata. Documentation and
attributes are lost, but they aren't used anyway. Unfortunately, argument names
are also lost because they are not present in the metadata. Source links are
also lost because the spans are not serialized.

While not perfect, it appears that presenting this documentation through rustdoc
is much better than nothing, so I wanted to land this to allow iteration on it
later on.
auto merge of #14346 : alexcrichton/rust/rustdoc-external-crates, r=pcwalton

This commit alters rustdoc to crawl the metadata of upstream libraries in order
to fill in default methods for traits implemented in downstream crates. This,
for example, documents the `insert` function on hash maps.

This is a fairly lossy extraction from the metadata. Documentation and
attributes are lost, but they aren't used anyway. Unfortunately, argument names
are also lost because they are not present in the metadata. Source links are
also lost because the spans are not serialized.

While not perfect, it appears that presenting this documentation through rustdoc
is much better than nothing, so I wanted to land this to allow iteration on it
later on.
libstd: Remove `~str` from all `libstd` modules except `fmt` and `str`.
libtime: Remove the `tz_zone` field from times.

It depends on `~str`.
libstd: Remove all uses of `~str` from `libstd`
libcore: Remove all uses of `~str` from `libcore`.

[breaking-change]