Added SQF Support

Added support for the SQF scripting language used in the Arma series and other games based on the Real Virtuality engine.

Some examples of its usage:
- https://github.com/Taosenai/tmr
- https://github.com/michail-nikolaev/task-force-arma-3-radio
- https://github.com/KoffeinFlummi/AGM
- https://github.com/X39/XMS2

... and some other, private repos.