Added 'flush console' with clr instruction
<More about instructions here>
Added stack with psh and pop instruction
Added several math instructions (mul - multiply, div - divide, mod - remainder)
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Added get instruction
Example ussage: get g_pressed sys_input KeyG
Get instruction allows for more things like gathering input, which returns 0 or 1,
depending if the button is pressed or not. It also allows for gathering stuff like time,
or random value.
For example: get rnd sys_env Random.
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