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.