Add public methods for get/get variables
Add tests for get/set vars
Add test for NULL VM
Add simple test to LOAD command. VM don't work.
Implement LOAD command: initial
Fixed bug: LOAD command loads value from invalid area
Add bonds tests for LOAD command
Fixed test for set/get var
Implement SAVE command
Add asserts to each vm init
Merge branch 'feature/global-vars' into develop