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Fixes #501

Fixes #590.

For completeness I've implemented escaping for characters outside the
basic multilingual plane, but it doesn't get used (as there's no
EscapeAsAsciiJson emitter option implemented).

Fixes #740.

Inside of a sequence or map, `YAML::Newline` wouldn't reset the collection state, which would cause behavior like this:

```
nodeA:   
    k: [{i: 0},
 {i:1},
  ]NodeB:
    k: [{i: 0},
 {i:1},
  ]
```

* Support kinds of emitter format-setting for YAML::Null.

* update the code and test cases

* add the comment //fallthrough

* fix issue752: generate right long keys

* Improve the readability of test cases

* update to raw string literal

* partially fix clang compilation

Missing header and mistaken algorithm usage.

Also removed it name from range loops. It's not correct.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

* run through clang's -Wrange-loop-analysis

Some range loops should not use references as they need to copy.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

* manual range loop conversions
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Fix issue 844/848.

Fixing issue 859.

Add test cases for the event handler for schema tags; does not include test cases for Node because specialized tag handling is not implemented yet.

E.g. `!2`.

Specifically, printing `.nan`, `.inf`, and `-.inf`, respectively, as per the spec section 10.2.1.4.

Invalid access via operator[] or as<> will now print the offending key, if possible.

For example:

a:
  x: 1
  y: 2

node["a"]["z"].as<int>()

will say that the key "z" was invalid.

ref #110

The issue is that numbers like
2.01 or 3.01 can not be precisely represented with binary floating point
numbers.

This replaces all occurrences of 'std::numeric_limits<T>::digits10 + 1' with
'std::numeric_limits<T>::max_digits10'.

Background:
Using 'std::numeric_limits<T>::digits10 + 1' is not precise enough.
Converting a 'float' into a 'string' and back to a 'float' will not always
produce the original 'float' value. To guarantee that the 'string'
representation has sufficient precision the value
'std::numeric_limits<T>::max_digits10' has to be used.

* Skip newlines in binary decoding
This fixes #387

* Skip all whitespace characters

This also removes spaces and tabs in addition to newlines.

Add EmitterStyle, which will allow sequence or map style (i.e., flow or block) to be preserved between parsing and emitting