-moved system destroy functionality to System structure "destroy()" function
-now arrays are properly destroyed (with destructor calling (__xdtor))
-fixed bug which makes BlockAllocator crashing after freeing it's memory
-fixed many smaller memory leaks
-empty components now take no memory, so flag components is now far better
-added test for critical bug
-fixed critical bug with adding/removing entities form inside events
-fixed small bug with TestRunner
-improve basic tests
-fixed betterC compilation on DMD
-remove EntityID form Event structure
-added "return" attribute to some functions
-moved some code from Tempalte side to actual implementation
-fixed bug with EntityTemplate copying
-commented out some possibliy unused code
-use code formatter
