Toxic standalone

Imported Toxic from ProjectTox-Core including commit history.

Created build scripts to allow standalone building of the client.

Run ```autoreconf -i``` to generate the configure script.

Compile as follows (substitute directories with wherever you have the deps and with wherever you want the make install target to be):
```./configure --prefix=/tmp/toxictest --with-libtoxcore-headers=/Work/Tox/ProjectTox-Core/core --with-libtoxcore-libs=/Work/Tox/ProjectTox-Core/cmb/core  --with-libsodium-headers=/tmp/sodiumtest/include/ --with-libsodium-libs=/tmp/sodiumtest/lib/```

Afterwards run ```make``` (toxic binary will be in ```./build/toxic```) and optinally ```make install```.