Revert #456 because it causes issues for known types (#495) and is not C++98-compatible.

* printf.h fixed to compile clean - need to check whether this is the right
thing to do

* fix warnings and errors in test compiles with BUILD_SHARED_LIBS

* did requested changes and added one change to allow all tests to succeed
in windows DLL

Fixes #505.

i test the the code on https://gcc.godbolt.org/, and only gcc 4.7 works,
gcc 4.6 fail to complie

With Sphinx 1.5, this is needed by searchtools.js to display the source
snippets (see sphinx-doc/sphinx#2454).

With earlier Sphinx versions, this is a no-op because the undefined variable
will evaluate to an empty string.

Fix Visual Studio 2017 new warning (C4244: 'argument': conversion from 'int' to 'const char', possible loss of data)

Fixes #491 (and probably #480) Before, the put-area of the custom streambuf
implementation was (sometimes) incorrectly extended beyond the writeable buffer.
The new implementation is in some cases not as efficient as the old, but avoids
to write into uninitialized memory.

This fixes compiling fmtlib in header-only mode when user code also has
something called 'Arg' defined. Now qualifying Arg struct with internal
namespace.

* Add default copy constructor to SystemError
* Add FMT_DEFAULTED_COPY_CTOR macro

Add join argument allowing formating list of values separated by a
string. Each value is formated according the format specifier.

When using the NDK 13b toolchain standalone or with CMake, ANDROID is not defined,
but __ANDROID__ is defined instead.

* allow to stream user defined types in a MemoryWriter

* fix indent

* follow Google C++ Style

* make code c++98 compatible

* fix macro usage

* disable ability to stream user defined types if not at least c++11

* fix for disable ability to stream user defined types if not at least c++11

* use FMT_STATIC_ASSERT

Managed C++ code doesn't have the _BitScanReverse* intrinsics, we must use the fallback code for count_digits etc.

* Allow %s as generic format specifier in printf

Signed integers are formatted as %d
Unsigned integers are formatted as %u
Doubles are formatted as %f
Chars are formatted as %c
Void Pointers are formatted as %p

* Remove '%S' handling and use visitor for generic format strings

* Default for floating point is now "%g" rather than "%f"

* A custom FormatSpec type can be passed as a template argument to the ArgFormatter chain (#439)

* Corrected nested-name-specifier error

* Spec template argument defaulted to FormatSpec

* Forward declaration of FormatSpec

* Style

* Style (part 2)

* Style (part 3)

* - added basic_string allocator support to BasicStringRef, BasicCStringRef, BasicWriter::str, StringBuffer and BasicStringWriter

* - removed templated str() and to_string() function
- code style fixes