Continued work on theme emulator

- Adds all missing mdm calls to the emulator.
- Clock updated to correct format.
- Blocks internet access for security reasons.
- Accepts multi-prompt dialogs on return key.
- Code cleaned
- Command line parameters: \<file> [fullscreen]
- Proposal for translation callback
 - The C code is completely untested, need to add json-glib, but my build-script knowledge doesn't go that far.

Anything else you'd like to have added ?