🐛 Correctly handle nested configs

Apologies for the extensiveness of this change. The configuration
handling likely needs a refactor to make it easier to support future
modification.

 - Add Apache Commons Configuration2

 - Adapt configuration2's INIConfiguration to support AWS quirks

 - Remove Ini4j (unmaintained, has park page for website)

 - Refactor file handling code

Resolves oktadev#141

pom.xml

@@ -75,6 +75,11 @@
  <artifactId>json</artifactId>
  <version>${json.version}</version>
  </dependency>
+ <dependency>
+ <groupId>org.apache.commons</groupId>
+ <artifactId>commons-configuration2</artifactId>
+ <version>2.3</version>
+ </dependency>
  <dependency>
  <groupId>org.apache.logging.log4j</groupId>
  <artifactId>log4j-api</artifactId>
@@ -85,11 +90,6 @@
  <artifactId>log4j-core</artifactId>
  <version>${log4j.version}</version>
  </dependency>
- <dependency>
- <groupId>org.ini4j</groupId>
- <artifactId>ini4j</artifactId>
- <version>${ini4j.version}</version>
- </dependency>
  <dependency>
  <groupId>org.jsoup</groupId>
  <artifactId>jsoup</artifactId>
@@ -138,6 +138,13 @@
  <version>1.0.0</version>
  <scope>test</scope>
  </dependency>
+ <!-- Dynamic dependency of commons-configuration -->
+ <dependency>
+ <groupId>commons-beanutils</groupId>
+ <artifactId>commons-beanutils</artifactId>
+ <version>1.9.3</version>
+ <scope>runtime</scope>
+ </dependency>
  </dependencies>
 
  <distributionManagement>