Allow customizing block sequence indentation

Hi,

right now snakeyaml emits block sequences with a hard-coded zero indentation before the list indicator, e.g.:

aaa:
  bbb:
  - x1
  - x2

I would like to be able to further customize the indentation and be able to specify a whitespace ammount before the list indicator, so that I have an output like this (or whatever whitespace I want before the list indicators):

aaa:
  bbb:
   - x1
   - x2

I've digged in Emitter.java and found that it indeed emits the list indicator right after emitting the parent block's indentation, my proposal is to allow a whitespace by pushing another intermediate indentation state:

592.                writeIndent();
593.                writeIndicator("-", true, false, true);

the fix should be minimal, I can help with it

thank you

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