Rewrote the scalar dumper with an emphasis on rigor, based on a careful reading of the YAML 1.2 spec and testing against LibYAML. Corrections: Block style chomping accounts for added the extra newline added by subsequent elements or at the end. Fixes nodeca#238. Top-level block scalars are indented. Fixes dumper side of nodeca#221. Folded style should be reliable now. The old dumper was not aware of the subtle rules for more-indented lines. More-indented lines no longer cause extra newlines to be added. (The old dumper also had an off-by-one error that dropped the last character from a long first word on a line.) Fixes nodeca#215, nodeca#222. Removes nodeca#217 workaround. Literal and folded styles can represent arbitrary "printable" strings, including leading/trailing whitespace. NB. For the 'construct-string-types' dumper test, the strings are dumped correctly. The test fails because a loader bug loses a newline when using the keep "+" chomping indicator. Additional: Added test suite covering several former bugs, new edge cases, and new expected behaviors. All previous applicable tests are included. Styles are chosen in a well-defined order. Plain and single are preferred for single lines under the width limit. Folded is preferred when a line is longer than the width limit (if enabled) and does not begin with a space. Literal is used for all other multi-line "printable" strings. Double-quoted is only used when a string is unrepresentable otherwise. Plain style is relaxed to include more characters and strings. Progress on nodeca#183. As indent increases, line width decreases down to min(lineWidth, 40). Setting lineWidth to -1 disables wrapping. Previously there was unexpected behavior past 40 indent: narrow lineWidth suddenly jumped to 40, and -1 (no limit) suddenly enforced a limit of 40.

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Dumper must not add trailing line break at the end #238

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