game: rephrase quit message, if more than 1 clients are connected
client thread: more robust handling of looper thread

if client disconnects immediately, a racecondition occures with the
SendThread when calling looper.quit() before the looper has been set up
by the SendThread. This should be a quick fix for the crash and race condition
lobby: dismiss dialog on disconnect
network: correctly treat unsigned char bytes in read network stream

fixes some checksum and length mismatches when receiving big packages,
where byte wraps to negative numbers.

add hackish method to convert from signed byte to "unsigned" using int.
network: don't throw exception on unknown message

rather log the error but try to continue gracefully, to allow implementing
more message types in the future.
game: don't hide player when it's our turn. remind player with animation every 5s.
game: fix colors by not allowing colors to be blended in transparent regions
char: fix chat message being illegally trimmed on receive

fixes re-sending of chat message in server causing invalid package
network: fix crash on send when socket has been null'ed

can happen after disconnect, just ignore sending packages then
results: make text color plain white to improve readability
network: read advanced server status with players and client names
game: show alert dialog on disconnect

still needs a flag, if the disconnect was initiated by the user or the server
jni: add cpp files and Makefile for native server code
jni/constants.cpp: log errors in android instead of stdout
jni/spielserver.cpp: don't use AI_ALL and AI_ADDRCONF

the flags prevented getaddrinfo from returning any addresses
jni: don't be verbose, use 2 threads for AI

running listener in verbose mode crashes jni
server: add jni shared object; use jni server by default on new game

on resume the java server is still used, because passing the game
to jni is not implemented yet
gitignore: add /obj folder for binary jni object files
jni: deploy new jni server library
jni: build native server lib for architectures: armeabi armeabi-v7a x86