cvs: Add more from/to options

[wader]

Add header option, on by default
Disable comments by default
Rename comma to delimiter
Add quote_char option
Add skip initial space option

Uses a forked version of std csv to support custom quote character

See top of csv.go for TODOs

[wader]

Related to #528

[wader]

See TODOs in csv.go, there are some questions how to handle header ordering, comments error conditions etc

With this one can do:

$ go run . -rn '[{a:"aaa",b:"hello"}, {a: "aaa", b: "world"}] | . as $v | to_csv | ., (from_csv | ., . == $v)'
a,b
aaa,hello
aaa,world

[
  {
    "a": "aaa",
    "b": "hello"
  },
  {
    "a": "aaa",
    "b": "world"
  }
]
true
$ go run . -rn '[["aaa","hello"], ["aaa","world"]] | . as $v | to_csv | ., (from_csv({header: false}) | ., . == $v)'
aaa,hello
aaa,world

[
  [
    "aaa",
    "hello"
  ],
  [
    "aaa",
    "world"
  ]
]
true