fix: Replace commander with hand-written command-line parser

Commander accepts a space as delimited of multiple values for an option.
It makes unclear what option the values belong to and forces "--" to be
inserted before the first argument following the option values.

BREAKING CHANGE: Although you shouldn't notice any change on the behaviour of the command line, something unexpected might've changed. Something did change
- if you're annoyed by inserting "--" between the multi-value option and other
arguments, you don't have to do it any more. Multi-value options can be entered
either using the option prefix multiple times for each value, or using
the option prefix just once and separating the values by commas.

README.md

@@ -121,33 +121,39 @@ Usage: `jsonlint [options] [--] [<file, directory, pattern> ...]`
     -f, --config <file>          read options from a custom configuration file
     -F, --no-config              disable searching for configuration files
     -s, --sort-keys              sort object keys (not when prettifying)
-    -E, --extensions <ext...>    file extensions to process for directory walk (default: ["json","JSON"])
+    -E, --extensions <ext...>    file extensions to process for directory walk
+                                 (default: json, JSON)
     -i, --in-place               overwrite the input files
     -j, --diff                   print difference instead of writing the output
     -k, --check                  check that the input is equal to the output
-    -t, --indent <num|char>      number of spaces or specific characters to use for indentation (default: 2)
+    -t, --indent <num|char>      number of spaces or specific characters to use
+                                 for indentation or a string with whitespace
     -c, --compact                compact error display
-    -M, --mode <mode>            set other parsing flags according to a format type (default: "json")
+    -M, --mode <mode>            set other parsing flags according to the format
+                                 of the input data (default: json)
     -B, --bom                    ignore the leading UTF-8 byte-order mark
     -C, --comments               recognize and ignore JavaScript-style comments
     -S, --single-quoted-strings  support single quotes as string delimiters
     -T, --trailing-commas        ignore trailing commas in objects and arrays
     -D, --no-duplicate-keys      report duplicate object keys as an error
-    -V, --validate <file...>     JSON Schema file(s) to use for validation (default: [])
-    -e, --environment <env>      which specification of JSON Schema the validation file uses
-    -x, --context <num>          line count used as the diff context (default: 3)
+    -V, --validate <file...>     JSON Schema file(s) to use for validation
+    -e, --environment <env>      which version of JSON Schema the validation
+                                 should use
+    -x, --context <num>          line number used as the diff context
+                                 (default: 3)
     -l, --log-files              print only the parsed file names to stdout
     -q, --quiet                  do not print the parsed json to stdout
     -n, --continue               continue with other files if an error occurs
-    -p, --pretty-print           prettify the input instead of stringifying the parsed object
+    -p, --pretty-print           prettify the input instead of stringifying
+                                 the parsed object
     -P, --pretty-print-invalid   force pretty-printing even for invalid input
     -r, --trailing-newline       ensure a line break at the end of the output
     -R, --no-trailing-newline    ensure no line break at the end of the output
     --prune-comments             omit comments from the prettified output
-    --strip-object-keys          strip quotes from object keys if possible (JSON5)
+    --strip-object-keys          strip quotes from object keys if possible
     --enforce-double-quotes      surrounds all strings with double quotes
-    --enforce-single-quotes      surrounds all strings with single quotes (JSON5)
-    --trim-trailing-commas       omit trailing commas from objects and arrays (JSON5)
+    --enforce-single-quotes      surrounds all strings with single quotes
+    --trim-trailing-commas       omit trailing commas from objects and arrays
     -v, --version                output the version number
     -h, --help                   display help for command