[FEATURE] Assignment of structure members

[frankhart2018]

Describe the solution you'd like
Assigning structure members using dot operator.

Example
Assuming hello struct defined and instantiated in a variable h:-

h.a_var = 1

Todo

1. Identify the dot operator
2. Make changes in variable assignment in parser, adding a new opcode will help.
3. Compile C code according to the newly generated opcode.