Implemented class ExecutionPlatform
which needed for adding another executor exept default
(for example such as jit compilator). Now class CodeBlock
is containing pointer to ExecutionPlatform object. Different
execution classes are inherited from ExecutionPlatform.
Implemented new command, destructors
Command "ne" (Not Equal) was added, commands
">, <, >=, <=, ==" (More, Less, More or Equal,
Less or Equal, Equal) now have "m, l, me, le, e"
names.