Fixes, fixes, fixes...
- `for` init-instruction have to be a primary-expresion now (so "for(for(var<int> i=0; i<10; i++); i<10; i++);" isn't a valid construction now)
- Changed `get_ticks` (from `time.ss`) to `get_milliseconds`+`get_millis` (they both do the same)
- Implemented `const` parameters
- Implemented `for(;;)` construction (and similar)
- Other fixes (arrays etc.)