fkYAML version 0.3.11

* rename encode_detector as utf_encode_detector

* restructured utf encode detector implementations

* optimized unnecessary amount of array element access during utf encoding detection

* added missing empty char sequence iterators test for utf encoding detection

* add deprecated attribute compile switches

* introduce node_type enum API, deprecating basic_node::node_t aliased enum type usage

* introduce yaml_version_type enum API, deprecating basic_node::yaml_version_t aliased enum type usage

* updated API reference pages

* added test cases for missed lines/branches

* run amalgamation

* replace m_node_type with m_attrs (enum class -> bits)

* merged anchor status type & offset into node attrs

* added doxygen comments

* added tests for node attributes related functions

* return begin/end iterators as token contents instead of unconditionally copying them into a work buffer

* scan scalar contents in deserializer, not in lexer

* reduce string copies when scanning scalars

* improved block scalar scanning

* separate plain scalar scannings based on inside/outside flow contexts

* made all lines/branches covered in the unit test app

* fixed build errors on macos / windows

* implemented low-level conversion functions from a scalar to null/bool/int

* optimized the way of scanning scalars

* implemented conversion function from scalars to floating point type values

* added bounds check into atoi()

* added test cases for scalar_conv.hpp, removing from_string tests

* conditionally use std::from_chars for conversions from scalars to floating point numbers if available

* added descriptions in scalar_conv.hpp

* fixed compile errors

* added test cases for missed lines/branches & add in-source docs in scalar_scanner.hpp

* fixed name collision between arg and index in atoi_dec_*() functions

* fixed clang-sanitizer errors & reconsidered its ignorant options

* fixed undefined reference to conv_limits::{min|max}_value_chars_dec

* dropped long double support in atof() due to portability issue

…on (#392)

* implemented basic_str_view (as a minimal implementation of std::basic_string_view since C++17)

* modified the way of passing input buffer to lexer

* wip: add test for basic_str_view class

* use str_view to store YAML & TAG directive values

* deleted unused type aliases in lexer

* return str_view as part of lexical_token from get_next_token()

* added in-source documentations in str_view.hpp

* removed unnecessary template parameter for lexer

* removed unused header includes

* no copy when input buffer has contiguous bytes with no CRs

* rename fill_buffer() as get_buffer_view() in input_adapter variant classes

* added test cases for missing lines/branches

* updated benchmark scores

* fixed compile errors/warnings

* suppress deprecated declarations warning when test app is built with Apple Clang compilers

* fixed include path in test source file for str_view

* fixed outside of array bounds errors

* fixed issue on large std::string instance creation for test

* added explicit conversion to resolve warning when compiled with msvc

* skip str_view comparison check with large strings if int == ptrdiff_t

* added compile switches for likely/unlikely & clean up C++ feature test macros

* added likely/unlikely macros at if statements

* fixed detections of likely/unlikely C++ attributes