fkYAML version 0.3.14

…f not forced with tag (#431)

…#433)

* updated Xcode versions to use with the macos-14 & macos-15 runner images

* removed GA workflow jobs using the macos-12 runner image

* updated the supported compilers list

* supported multiline plain scalars in lexer

* support multiline plain scalars in scalar_parser

* added more test cases for multiline plain scalars

* silenced clang-tidy error

* [bot] run clang-format & amalgamation

* fixed clang-tidy errors

* separate block scalar content indent level into base and indicated indent levels in lexer

* emit error if a following content line of a block scalar is less indented

* emit error if a leading empty line is more indented than the first non-empty line in a block scalar

* fixed parsing more-indented empty lines in block folded scalar contents in scalar_parser

* fixed clang-tidy error

* added g++4.8, 5, 6 for CI

* updated clang versions to use in ci

* updated the supported compilers list

* fixed invalid parse result when input YAML begins with a newline

* added missing includes in example cpp file for get_value()

* resolved warnings in building examples

* [bot] run clang-format & amalgamation

…438)

* removed unnecessary tag dispatcher structs

* added container types as basic_node's member types

* minor fixes for iterator class implementation

* make iterators constructible & comparable with value constness is different from each other

* run amalgamation

* added cbegin() & cend() functions to basic_node class

* implemented reverse iterator for container nodes

* added functions in basic_node for reverse iterations

* updated api documentation pages

* fixed links to documentation pages

* fixed segmentation violation signal errors

…#439)