Added first implementation of nick list

...e/kuschku/libquassel/syncables/types/impl/IrcChannel.java

...a/de/kuschku/libquassel/syncables/types/impl/IrcUser.java

...a/de/kuschku/libquassel/syncables/types/impl/Network.java

...ku/libquassel/syncables/types/interfaces/QIrcChannel.java

...schku/libquassel/syncables/types/interfaces/QNetwork.java

...java/de/kuschku/quasseldroid_ng/ui/chat/ChatActivity.java

...a/de/kuschku/quasseldroid_ng/ui/chat/NickListWrapper.java

...de/kuschku/quasseldroid_ng/ui/chat/drawer/BufferItem.java

...e/kuschku/quasseldroid_ng/ui/chat/drawer/NetworkItem.java

app/src/main/java/de/kuschku/util/CompatibilityUtils.java

app/src/main/java/de/kuschku/util/irc/ModeUtils.java

...java/de/kuschku/util/observables/lists/ObservableSet.java