OZG-1614 move files to sub package; create Property class; remove serializable

goofy-server/src/main/java/de/itvsh/goofy/JwtTokenUtil.java

...y-server/src/main/java/de/itvsh/goofy/RootController.java

...r/src/main/java/de/itvsh/goofy/SecurityConfiguration.java

...mmon/downloadtoken/DownloadTokenAuthenticationFilter.java

...h/goofy/common/downloadtoken/DownloadTokenController.java

...h/goofy/common/downloadtoken/DownloadTokenProperties.java

...vsh/goofy/common/downloadtoken/DownloadTokenResponse.java

...tvsh/goofy/common/downloadtoken/DownloadTokenService.java

goofy-server/src/main/resources/application.yml

...server/src/test/java/de/itvsh/goofy/JwtTokenUtilTest.java

...rver/src/test/java/de/itvsh/goofy/RootControllerTest.java

...ownloadtoken/DownloadTokenAuthenticationFilterITCase.java

.../downloadtoken/DownloadTokenAuthenticationFilterTest.java

...ofy/common/downloadtoken/DownloadTokenControllerTest.java

.../goofy/common/downloadtoken/DownloadTokenServiceTest.java