EMI: Implement/enhance LUA sound calls

Enhance functions:
- Lua_V2::PlaySound: make usage of volume parameter
- Lua_V2::PlayLoadedSound: make use of volume parameter

Implement functions:
- Lua_V2::GetSoundVolume
- Lua_V2::SetSoundVolume

Implement the sound positioning in:
- Lua_V2::PlaySoundFrom
- Lua_V2::PlayLoadedSoundFrom
- Lua_V2::UpdateSoundPosition