Split code into modules, implement early parts for later module usage

app/build.gradle.kts

...a/de/kuschku/quasseldroid/protocol/io/CoroutineChannel.kt

...hku/quasseldroid/protocol/io/FixedDeflaterOutputStream.kt

...uschku/quasseldroid/protocol/io/ReadableWrappedChannel.kt

...java/de/kuschku/quasseldroid/protocol/io/StreamChannel.kt

...uschku/quasseldroid/protocol/io/WritableWrappedChannel.kt

app/src/test/java/de/kuschku/quasseldroid/ExampleUnitTest.kt

bitflags/build.gradle.kts

bitflags/src/main/java/de/kuschku/bitflags/Flag.kt

bitflags/src/main/java/de/kuschku/bitflags/Flags.kt

bitflags/src/main/java/de/kuschku/bitflags/toBits.kt

bitflags/src/main/java/de/kuschku/bitflags/toEnumSet.kt

bitflags/src/main/java/de/kuschku/bitflags/toFlag.kt

build.gradle

protocol/build.gradle.kts

...de/kuschku/libquassel/protocol/connection/ProtocolInfo.kt

...e/kuschku/libquassel/protocol/features/ExtendedFeature.kt

.../de/kuschku/libquassel/protocol/features/LegacyFeature.kt

...va/de/kuschku/libquassel/protocol/io/ChainedByteBuffer.kt

...n/java/de/kuschku/libquassel/protocol/io/StringEncoder.kt