GenericValue::CopyFrom: add option to force copying of strings

Copying the result of an in-situ parsing into another value/document
currently requires that the original buffer - still holding the strings
from the parsing, outlives the  destination object as well.

In order to obtain a "full" copy of a GenericValue, this commit adds
an optional flag `copyConstStrings` to `CopyFrom`, which then forces
to take a copy of all embedded strings in the source value.

This solves the problem discussed in #962.

typo

See #930

Add convenience method Key(std::basic_string<Ch> const&) to Writer

Add fallthrough attribute to suppress GCC 7.1 warning

typo

Added ARM-Neon support for SIMD.SkipWhitespace*

Minor fixes

Change-Id: Iaf210d029758723a7eeb7f28fc10cab7467889a9
Signed-off-by: Jun He <jun.he@arm.com>

Fix a non-type template parameter type mismatch

RAPIDJSON_STATIC_ASSERT: use C++11 static_assert, if available

This issues a warning in gcc7.

Fix #910 incorrect casting

Fix #905 unable to set writeFlags for PrettyWriter

Fixed bug on space hexadecimal encoding

fix typos in doc code

update to create config file which is independent from actual install…

Writer flush api

Issue 889 pretty writer

Missed PrettyWriter in the initial fix for Issue #889

This is helpful if you’re writing code that needs to control flush
behavior and you don’t want to pass around your buffer object to each
handler function alongside the writer. Seems like an easy convenience
to add.