* Update password_generator.py
1. Use secrets module instead of random for passwords as it gives a secure source of randomness
2. Add type annotations for functions
3. Replace ctbi (variable for the characters to be included) with a more meaningful and short name
4. Use integer division instead of obtaining the integer part of a division computing a floating point
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* Added print function into matrix_multiplication_addition.py and removed blank space in data_structures/binary tree directory
* Removed .vs/ folder per #893
* Rename matrix_multiplication_addition.py to matrix_operation.py
* Added main() function and simplified password generation.
* Modified password_generator.py file according to suggestions in #968
Uses import random for namespace cleanliness
Uses list instead of string for 'chars' variable in order to shuffle, increases randomness
Instead of string formatting, uses string concatenation because (currently) it is simpler
