Fixed several issues on KitKat and JellyBean, improved UI

app/build.gradle

app/src/main/AndroidManifest.xml

...ain/java/de/kuschku/quasseldroid_ng/ui/LoginActivity.java

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

...chku/quasseldroid_ng/ui/chat/drawer/BufferViewHolder.java

...hku/quasseldroid_ng/ui/chat/util/SlidingPanelHandler.java

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

app/src/main/res/drawable/badge.xml

app/src/main/res/layout/activity_main.xml

app/src/main/res/layout/widget_buffer.xml

app/src/main/res/layout/widget_core_account.xml

app/src/main/res/layout/widget_core_account_add.xml

app/src/main/res/layout/widget_editor.xml

app/src/main/res/layout/widget_identitynick.xml

app/src/main/res/layout/widget_networkserver.xml

app/src/main/res/layout/widget_nick.xml

app/src/main/res/layout/widget_slider.xml

app/src/main/res/values-land/dimens.xml

app/src/main/res/values-sw600dp/dimens.xml

app/src/main/res/values/dimens.xml