* #496 Add pipeline module to parent pom ✨
* #496: Add main application class and test for pipeline
* #496: Checkstyle format and add log messages on pipeline stages 🎨
* #496: Fill readme sections of pipeline ✨
* #496: Javadocs and checkstyle formatting 🎨
* #496: Follow PMD checks and add more explanation as block comment on App.java
* #496: Apply requested PR changes by iluwatar 🎨
* #970: Replace log4j usage on commander pattern to Slf4j API 🎨
* #970: Replace log4j usage on dao pattern to Slf4j API 🎨
* #970: Replace log4j usage on data mapper pattern to Slf4j API 🎨
* #970: Remove log4j dependency on data transfer object pom 🔥
* #970: Replace log4j usage on module pattern to Slf4j API 🎨
* #970: Replace log4j usage on serverless pattern to Slf4j API 🎨
This also removes the aws log4j dependency
* #970: Remove unnecessary gitignore line for log4j.xml 🔥
* #970: Remove remaining remnants of log4j 🔥
* #970: Replace System.out logging with appropriate logging methods 🎨
* #970: Replace System.out method references to Logger::info 🎨
* 1) Test cases were not stopping AudioService before ending test case 2) Changed Audio to be a good singleton, previously because of Audio being bad singleton, test cases which were using static methods could have caused intermittent failures. 3) Made some other refactorings as well
* Removed sonar issue and converted Audio to eager singleton for simplicity
* Updated class diagram PNG
When the system is not capable to play the sound, do not throw
exception, just log it. For example on Linux there are several issues to
play sound and there are no workarounds for that :(
