#414 Move api and client into separate maven modules

api/pom.xml

api/src/main/java/fitconnect/api/Sender.java

api/src/main/java/fitconnect/api/Subscriber.java

api/src/main/java/fitconnect/api/auth/OAuthService.java

api/src/main/java/fitconnect/api/auth/OAuthToken.java

api/src/main/java/fitconnect/api/data/Attachment.java

api/src/main/java/fitconnect/api/data/Data.java

api/src/main/java/fitconnect/api/data/Metadata.java

api/src/main/java/fitconnect/api/logger/SdkLogger.java

...main/java/fitconnect/api/validation/ValidationResult.java

client/pom.xml

client/src/main/java/fitconnect/client/ClientBuilder.java

client/src/main/java/fitconnect/client/FitCoAuthService.java

client/src/main/java/fitconnect/client/SubmissionSender.java

client/src/main/java/fitconnect/client/TestRunner.java

...est/java/fitconnect/client/OAuthTokenIntegrationTest.java

pom.xml