Don't auto-detect type and default value when documented config/property
name doesn't match up with name from code.

When singleton:true inside Ext.define config.

Place default value to separate line in cfg/param description.

For required config options, display label (analogus to "static").

Simplified the code quite a bit.

Config options are optional by default, except when labeled with
"(required)".

Not really that good as sometimes the values are really long.

Using it for parsing right side expression of assignment.

Allows us to implicitly detect default values for @cfg.

Minor modifications to JsLiteralParser to make it fail when
syntax error encountered while parsing object literal.

Simple helper to turn JsLiteralParser output back into string.

Helper for parsing JavaScript literals.

First parsing tokens into a buffer, so no token needs to be scanned
twice.  Still... the scanpointer of StringScanner is only advanced
when #next method is called.

The scanpointer of StringScanner is only advanced when Lexer#next called.

This allows us to do partial lexing on a string.

First off supporting String, Number, RegExp, and Boolean.

Supporting all JavaScript literals:

- Number
- String
- RegExp
- Boolean
- Array
- Object

Because the string "(optional)" is no more part of the description,
we need to add it when rendering the long parameters list.

Now supporting both:

    @param {Type} foo (optional)
    @param {Type} [foo]

Mostly just ensuring that we don't crash if bogus input is given.