* Remove builtin functions: 'include' & 'require'
* Implement 'include' and 'require' statements compiler
* Implement OP_INCLUDE operator
* Allow 'require' statement to be used in global scope as well as in method body and 'include' only in method body

* VmExecIncludedFile() does not need a call context
 * Builtin include() function does not need to return false, it throws an error

* include() builtin function allows now to include a chunk of code, eg. a body of some loop
 * include() allows to load and execute file several times
 * require() still allows to include file just once and included file must have a valid OOP syntax
 * both functions will throw E_ERROR when impossible to include specified file

PHP returns a NULL for each call to non-existen array element, while AerScript design disallows usage of indexes outside the bounds. This fixes one of most serious PHP problems.

The size of a structure is greater than the sum of its parts because of what is called packing. A particular processor has a preferred data size that it works with. Most modern processors' preferred size if 32-bits (4 bytes).