feat(parser): print function bodies like bash and close BashBox parser gaps (45 cases) - #2599

…-eafupr-bashbox-corpus

# Conflicts:
#	THIRD_PARTY_LICENSES/README.md

…r gaps

- type / declare -f print function bodies via a print_cmd.c port
  (parser/print_cmd.rs); words keep source text while parsing function
  bodies; function bodies may be any compound command with redirections
- (( )) and for (( )) read raw up to the matching )); heredoc delimiter
  quoting decided from its source text; several heredocs per command
- ]] closes [[ only as a whole word; |& is 2>&1 |
- backquoted bodies that fail to parse error at run time (status 2)
- process substitution ends where the substitution scanner closes it
- ${x:-$(cmd)} runs operand substitutions only when the operand is used;
  quoted replacement text keeps } inside '...'
- LINENO honors local/unset; script children keep caller cwd and shared
  stdin position; command ./script runs scripts; eval/source parse
  errors exit 2
- simple-command word/redirect handling outlined so nested $( ) parsing
  uses less stack than before

… error gap

…-eafupr-bb-printer

# Conflicts:
#	crates/bashkit/src/parser/mod.rs
#	crates/bashkit/tests/spec_cases/bash/bashbox-compound-syntax.test.sh
#	crates/bashkit/tests/spec_cases/bash/bashbox-lexer.test.sh
#	crates/bashkit/tests/spec_cases/bash/bashbox-line-number.test.sh
#	crates/bashkit/tests/spec_cases/bash/bashbox-parser.test.sh
#	crates/bashkit/tests/spec_cases/bash/bashbox-script-file.test.sh
#	crates/bashkit/tests/spec_cases/bash/bashbox-syntax-error.test.sh
#	crates/bashkit/tests/spec_cases/bash/bashbox-type-printer.test.sh

…-eafupr-bb-printer

# Conflicts:
#	crates/bashkit/src/parser/lexer.rs
#	crates/bashkit/src/parser/mod.rs

…-eafupr-bb-printer

A function call is the recursion path. Dispatching it from the same
future as the builtin and PATH-search arms put that whole frame on the
stack at every call level, so 16 nested calls overflowed a 2 MiB stack
in debug builds. Functions now get their own small future. Also adds
the raw field to the Word built by main's array-literal change.

The unary-sign change made 2 ** -1 parse its exponent as -1, which
the clamp turned into 2 ** 0 = 1. Keep the evaluator's error value 0.

…-eafupr-bb-printer

# Conflicts:
#	crates/bashkit/src/interpreter/mod.rs

…-eafupr-bb-printer