Renamed Client object, fixed a few typos in the RPC call names

app/src/main/java/de/kuschku/libquassel/CoreConnection.java

...src/main/java/de/kuschku/libquassel/IProtocolHandler.java

app/src/main/java/de/kuschku/libquassel/ProtocolHandler.java

app/src/main/java/de/kuschku/libquassel/QuasselClient.java

app/src/main/java/de/kuschku/libquassel/client/AClient.java

...main/java/de/kuschku/libquassel/client/BufferManager.java

app/src/main/java/de/kuschku/libquassel/client/Client.java

...in/java/de/kuschku/libquassel/client/IdentityManager.java

...ain/java/de/kuschku/libquassel/client/NetworkManager.java

app/src/main/java/de/kuschku/libquassel/client/QClient.java

...n/java/de/kuschku/libquassel/client/QClientInterface.java

...de/kuschku/libquassel/localtypes/NotificationManager.java

.../libquassel/localtypes/backlogmanagers/BacklogFilter.java

.../libquassel/localtypes/backlogstorage/BacklogStorage.java

...assel/localtypes/backlogstorage/MemoryBacklogStorage.java

...de/kuschku/libquassel/syncables/types/SyncableObject.java

...kuschku/libquassel/syncables/types/impl/AliasManager.java

...schku/libquassel/syncables/types/impl/BacklogManager.java

...kuschku/libquassel/syncables/types/impl/BufferSyncer.java

...hku/libquassel/syncables/types/impl/BufferViewConfig.java