[#4766] wrote tests to indicate behavior is opt-in

- Added `setUseIncludePath()` call to translator adapters
- added flag, Factory::USE_INCLUDE_PATH, as second argument to config
  factory
[#4766] Config makes include_path usage opt-in only

- You must pass the `$useIncludePath` to either `fromFile()` or
  `fromFiles()` for it to be used. Constants were created with boolean
  values for those using IDEs.
[#4766] Make include_path abilities opt-in in Translators

- Created AbstractFileLoader, which provides implementation details for
  when/how to use the include_path to load translation file assets.
- Updated INI, gettext, and PHP loaders to extend AbstractFileLoader.
[#4766] Add docblock detailing how to set include_path flag

- Added to translator loader plugin manager
Remove constants

- Remove constants, per @DASPRiD
Add Config\Reader for Java-style properties
Add unit tests and test assets for Zend\Config\Reader\JavaProperties
Conform to ZF2 contribution coding standards
Fix unit tests for invalid properties
Support use of the exclamation point "!" as comment mark
Fix indentation and eof newline for code standards
Fix docblock tags
Fixed spacing with php-cs-fixer
Removed namespace alias
Removed confusing lines from test assets
Fixed spacing in parse method
Clarified test for invalid include in string
Removed assertions for confusing lines from test assets
allow usage of validator and filter plugin managers in input filter factory if form manager injected
`fault` property must be an instance of \Zend\XmlRpc\Fault