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- Don't eagerly convert key to std::string
- Make const char* keys streamable when exception is thrown
- Don't create a temporary string when comparing a const char* key

Fixes #917

Fixes #501

Fixes #590.

Not use 'emit' as variable name, in Qt Framework it reserved word

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).

Per https://cmake.org/cmake/help/latest/policy/CMP0091.html, we need to
enable policy CMP0091 if we want to make use of MSVC_RUNTIME_LIBRARY
and/or CMAKE_MSVC_RUNTIME_LIBRARY.  Fixes issue #912.

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

Found with modernize-use-auto
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with performance-unnecessary-value-param
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with readability-container-size-empty
Signed-off-by: Rosen Penev <rosenp@gmail.com>

* 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>

Found with modernize-return-braced-init-list
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with readability-inconsistent-declaration-parameter-name
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with modernize-use-bool-literals
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with modernize-raw-string-literal
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with modernize-use-emplace
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with modernize-use-using
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with modernize-use-override
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with modernize-use-equals-default
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with modernize-loop-convert
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Found with readability-else-after-return
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Fix issue 844/848.

* spelling: differently

* spelling: irrelevant

* spelling: specified

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.