Merge pull request #8 from chrox/master

export configuration API to android module
add an FFI based version of lo_dlopen()
use FFI for dlopen() and determining paths

we can use FFI and JNI to aquire paths from the Android framework.
That way, the C launcher can stay quite simple, plus we might reuse
the JNI gateway later in Lua code.

Also, lo_dlopen() is dropped (mainly for license concerns) and
replaced by a Lua/FFI based version.
also search in "." for libraries when dlopen()
remove old test script
add a few declarations from the ANativeActivity API
finish() when quitting
get dimension of default screen via FFI