Bugfix in std.conv.parseEscape

parseEscape was not parsing the escapes:
\
0
'
"
?
unittests for parseEscape
Update unittest to take into account...

...Octal escapes and named character entities. These still don't work, but there was a test checking octal would throw, which is wrong.
Fix strideBack for ref ranges.
Added tests for reference type ranges to stride.
Fix for issue# 9456.

This change makes it so that decodeFront takes its range by ref and pops
off the code units that it decodes (unlike decode). It pretty much has
to do that, since it supports input ranges, and they can't do anything
else.
Swap a couple of overloads in std.utf.

This makes no semantic difference to the code, but it makes it so that
the attributes which are on one of the overloads don't make it into the
documentation (where they would imply that all of the overloads have
those attributes, which is not correct).
Minor tweak to decodeFront per review.
Remove some undocumented, deprecated functions which are slated for removal.

These have been deprecated for a while, but there was some balking
(primarily from Andrei IIRC) at actually removing them when they were
slated for removal, so they were instead made undocumented and slated
for removal after yet another 6 months or so. So, now that that time has
passed, here's another attempt to actually remove them.
add cov testing to win32.mak
Merge pull request #1176 from jmdavis/deprecated

Remove some undocumented, deprecated functions which are slated for removal.
Fix typo in comment
Merge pull request #1181 from monarchdodra/convEscape

Bugfix in std.conv.parseEscape
Add `std.traits.isNestedFunction`.

As I see no cases where nestidness check for both types and functions is required a new `isNestedFunction` template is created instead if adding an overload to `isNested`.
Merge pull request #1220 from denis-sh/add-trait-fron-nested-function-check

Add `std.traits.isNestedFunction`.
fix int overflow
Update in chunks

reduces requirements to ForwardRange
Merge pull request #1226 from WalterBright/fixintoverflow

fix int overflow
Removed deprecated functions from std.path
Update index.d

Fix std.ascii link