simple sample for extensions added
improve building
minor improving
ext2 added
a few ext sample added
Created stack
Created context control functions signatures
Created context control functions
Added pick stack function
Implemented context get function
Implemented stack's function find
Implemented get function of context
Function fillOpTable updated to use Context
Function import updated to use Context
Added stack and context into MakeFile
Updated call of execute function in main.c
Updated signature of execute in executor.h
Function execute uses Context
All buildin functions signatures are changed to use Context
All builtin functions updated to use Context