ini: enhance error handling, add support for colon comments, unicode escapes, new test file

test/README.md

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+# Test Files for JOE Syntax Highlighting
+
+This directory contains files for testing and validating .jsf files. Select features and problematic cases should be added to these files to ensure that new features and bug fixes don't break existing functionality.

test/ini-test.ini

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+; ini-test.ini -- file for testing ini.jsf
+; License: GPL
+; by Todd Lewis (https://github.com/utoddl)
+;
+; See https://en.wikipedia.org/wiki/INI_file for .ini specs
+; Normal (;) line comment
+# Alternative (#) line comment
+[broken_section_head)
+bsh1=normal_value_with_equals_sign_as_separator
+bsh2:normal_value_with_colon_as_separator
+
+[escape_char_section] with evil trailing chars
+; Valid esc chars: \ 0 a b t r n ; # :
+; and unicode "Basic Multilingual Plane" (4 hex digits) after "\x"
+alphas=\a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
+valid_esc=~\\~\0~\a~\b~\t~\r~\n~\;~\#~
+unicodes=~~\x~~\x1~~\x12~~\x123\a~~\x1234~~\x12345~~
+# another comment
+ecs1_missing_value ; Not a trailing comment b/c no equal sign!
+ecs2 =   # value w/ leading whitespace!
+ecs3=value with continuation \
+      on the next line.
+
+[quotes_and_trailing_comments]
+; The following quotes should be insignificant according
+; to https://en.wikipedia.org/wiki/INI_file, but some
+; implementations allow it. Likewise, trailing comments are
+; not spec, but often honored.
+qatc3="quoted value" # not technically a comment, but lovely green.
+qatc4="quoted value \# w/o comment"
+qatc5="quoted value # w/ comment?" ; No right answer!
+qatc6_missing_value
+
+[second_borken_section
+sbs1='val \x \'' ; These single quotes aren't spec either.
+
+differently_borken_section]
+dbs1_no_val_but_with_equals=
+dbs2 = good_value_with_whitespace_around_equals