EventsConfig.createSiteParsers(): split the logic

[0pdd]

The puzzle 801-71f4f89c from #801 has to be resolved:

mystamps/src/main/java/ru/mystamps/web/config/EventsConfig.java

Lines 148 to 149 in 0dac42b

	// @todo #801 EventsConfig.createSiteParsers(): split the logic for properties
	// parsing and the object instantiation

The puzzle was created by Slava Semushin on 02-Jan-18.

[php-coder]

The idea is to parse properties, put them in a Map<String, String> and pass it to builder that will create a fully-initialized object. It separates logic and also allows us to remove setField() and isFullyInitialized from SiteParser interface.

This also could solve ModifiedCyclomaticComplexity warning from PMD.

[php-coder]

We won't have such log after migrating site parsers configuration to database (see #975)