Update freetype
Fix a potential NPE if ext storage is unavailable.

Also refactor the application references in the activities. Still needs
further work because it's very untidy at the moment.
Bring back LuaJIT

Don't include it yet though.
Pass Configuration object to initialiser
Update configuration to be read by c/Lua
Update Spanish translations (miguelkill)
Update Hungarian translations (hun_gery)
Update Russian translations (Nekser)
Update Finnish translations (ramiselin, PatrikSelin)
Update Dutch translations (Omni)
Add Polish translations (lordzik, abaranski12)
Update Danish translations (Lef1zh)
Add new translators to README
Clean .mk files
LuaJIT isn't ready yet. Stick with LUA.
Add IntelliJ IDEA project files
Don't load libraries unnecessarily
Add more IntelliJ IDEA files
Add French translations (neuripide, Alexis Mellone, Michel)
Update Polish translations (lordzik)