Bell++, die Pulse!, Automaton -> .lua

- ozCore
  * System
    + alloca() used for bell sample data allocation
    + PulseAudio support dropped
    + NaCl bell cleanup
- common, nirvana
  * removed Automaton class & co.
- lua
  * implemented finite automaton in Lua
  * updated script header comments/notices
Lua scripts++, Mono--, make -> ninja

- tests
  * removed Mono integration test
- lua
  * more code reusability, common functions moved to library
  * droid mind rewritten as Lua automaton
- scripts
  * make replaced by ninja in build.sh and other scripts
Exception handlers--

- ozCore
  * System doesn't set exception handlers any more, default ones provide better
    exception diagnostics and crash handler is still called because of SIG_ABRT