[0025] [ndf-script] [debt] Clean variables

[greg-ynx]

Check each variables in the project and apply the following guidelines:

• Must be ASCII compatible
• Private variables should have the double underscore prefix, ex: __variable
• Protected variables should have the underscore prefix, ex: _variable
• Constants should adopt the UPPER_SNAKE_CASE namming convention, ex: MY_CONSTANT
• Variables (Private, protected, public and global) should adopt the snake_case namming convantion, ex: my_variable
• Never abbreviate variables name, ex: my_var non-compliant -> my_variable compliant
• Variables with a sigle letter are allowed only for a looping context, ex: loop counters

[greg-ynx]

Hot fix pushed to v2.0.X