Optional keeping empty strings

Adding more parametrization: the allowEmptyStrings attribute of FixedField annotation for keeping empty string for values as described in #46 .
Example of configuration:

@FixedField(offset = 1, length = 3, padding = Character.MIN_VALUE, allowEmptyStrings = true)

Java records experimental support

There is a java 14+ records support. It will not break java 8 support.

Custom predicate

Before for mixed lines there was only option indicate if line of type starts with. Now there is custom predicate support where you could place any logic you want.

Inheritance support

Now library could pull fields even from superclasses. Thanks @shotishu for contribution!

Add ignoring errors mode

0.9

add ignoring errors modes

Support for not only public fields

0.8

increase version

0.7

Fixes StackOverflowError when SplitLineAfter returns 0 #17

0.6

Generics support

0.5

fix style

0.4

add benchmark