Rearranged some classes

src/main/java/beamline/filters/ExcludeActivitiesFilter.java

...eamline/filters/ExcludeOnCaseAttributeEqualityFilter.java

...amline/filters/ExcludeOnEventAttributeEqualityFilter.java

src/main/java/beamline/filters/RetainActivitiesFilter.java

...beamline/filters/RetainOnCaseAttributeEqualityFilter.java

...eamline/filters/RetainOnEventAttributeEqualityFilter.java

src/main/java/beamline/miners/DiscoveryMiner.java

src/main/java/beamline/miners/ProcessMap.java

.../java/beamline/models/algorithms/HookEventProcessing.java

...ava/beamline/models/algorithms/StreamMiningAlgorithm.java

...java/beamline/models/filters/EventNameFilterKeepOnly.java

src/main/java/beamline/models/filters/XesFilter.java

src/main/java/beamline/sources/MQTTXesSource.java

src/main/java/beamline/sources/Source.java

src/main/java/beamline/sources/XesLogSource.java

src/main/java/beamline/sources/XesSource.java

src/main/java/beamline/tester/Tester.java

src/main/java/beamline/view/graph/ColorPalette.java

src/main/java/beamline/view/graph/PMDotEdge.java

src/main/java/beamline/view/graph/PMDotEndNode.java