Created document validation and other improvements

[misteregis]

Changes:

• Created document validation;
• Addition of consumer's name/document on the checkout screen;
• Removed parentheses (if there is no complement in the address);
• Removed restriction when adding product to order;
• Fixed ambiguity in name search in variations;
• Fixed ambiguity when removing payment at checkout;
• Created .env file (see .example.env file)
• Created configurator class to read parameters from .env file;
• Created coupon print screen and button;