tests/indent: add miscellaneous test cases found during clean up

indent: fix spacing between postfix operator and left parenthesis

indent: allow more than 20 nested parentheses or brackets

indent: fix indentation of continuation lines in initializers

indent: fix indentation of initializer lists with designators

tests/indent: add more tests, from indent's own code

indent: force at least one space after the colon of a label

indent: rename struct field, for better symmetry

No binary change outside debug mode.

indent: fix indentation of initializers in compound expressions

indent: fix formatting of compound expressions, at least partially

indent: remove support for form feed characters inside a line

Form feeds are occasionally used to split code into pages, and this use
is still supported. Having a form feed in the middle of a line is
exotic.

indent: remove broken code for handling blank lines

This fixes several bugs where blank lines were erroneously added or
removed, treating these old bugs for new bugs in different places.
These new bugs are expected to be easier to fix, as the old bugs will
not interfere anymore.

tests/indent: change directive from '#' to '//'

Using a '//' instead of '#' turns the directives into well-formed C
code, resulting in fewer error markers in the editor.

tests/indent: migrate tests for parentheses, brackets, braces

tests/indent: add tests for unary and binary operators

indent: remove FreeBSD IDs

Most of the IDs were empty anyway.

tests/indent: test token '('

There are already some tests in token_lparen.c that need to be merged.

tests/indent: demonstrate the poor handling of compound literals

tests/indent: add skeletons for testing tokens and parser symbols

The constants that were previously defined in indent_codes.h were a wild
mixture of tokens from the lexer and symbols on the parser stack. They
were split into separate types starting at indent.h 1.49 from 2021-10-25
and finishing at 1.73 from 2021-10-31.

To match the tests with the new token names, the old tests need to be
migrated to the newly added tests. This will take some time so first
add the skeletons and migrate them in smaller steps, cleaning them up
and extending them on the way.

tests/indent: change directive from '#' to '//'

Using a '//' instead of '#' turns the directives into well-formed C
code, resulting in fewer error markers in the editor.

tests/indent: migrate tests for parentheses, brackets, braces

tests/indent: add tests for unary and binary operators

indent: remove FreeBSD IDs

Most of the IDs were empty anyway.

tests/indent: test token '('

There are already some tests in token_lparen.c that need to be merged.

tests/indent: demonstrate the poor handling of compound literals

tests/indent: add skeletons for testing tokens and parser symbols

The constants that were previously defined in indent_codes.h were a wild
mixture of tokens from the lexer and symbols on the parser stack. They
were split into separate types starting at indent.h 1.49 from 2021-10-25
and finishing at 1.73 from 2021-10-31.

To match the tests with the new token names, the old tests need to be
migrated to the newly added tests. This will take some time so first
add the skeletons and migrate them in smaller steps, cleaning them up
and extending them on the way.

indent: remove FreeBSD IDs

Most of the IDs were empty anyway.

tests/indent: test token '('

There are already some tests in token_lparen.c that need to be merged.

tests/indent: demonstrate the poor handling of compound literals

tests/indent: add skeletons for testing tokens and parser symbols

The constants that were previously defined in indent_codes.h were a wild
mixture of tokens from the lexer and symbols on the parser stack. They
were split into separate types starting at indent.h 1.49 from 2021-10-25
and finishing at 1.73 from 2021-10-31.

To match the tests with the new token names, the old tests need to be
migrated to the newly added tests. This will take some time so first
add the skeletons and migrate them in smaller steps, cleaning them up
and extending them on the way.

tests/indent: test token '('

There are already some tests in token_lparen.c that need to be merged.

tests/indent: demonstrate the poor handling of compound literals

tests/indent: add skeletons for testing tokens and parser symbols

The constants that were previously defined in indent_codes.h were a wild
mixture of tokens from the lexer and symbols on the parser stack. They
were split into separate types starting at indent.h 1.49 from 2021-10-25
and finishing at 1.73 from 2021-10-31.

To match the tests with the new token names, the old tests need to be
migrated to the newly added tests. This will take some time so first
add the skeletons and migrate them in smaller steps, cleaning them up
and extending them on the way.