Idea Summary
Add one New Page Item to APEX to mask Number or text give ability to current page text/number page item to behave like password field.

Use Case
While developing banking application i was used password page item to mask - Confirm bank account number field. but when users started using app it was Autopoppulating Username and password in Account number filed from browser saved passwords, Due to Password page item type it was happening. If you provide ability to mask text/number textfield this issue will not happen again. (Eg. Account number *********** , Credit card - ********)

Preferred Solution (Optional)
Give New page Item to APEX like (Mask Text/Number) Or you can provide provision like toggle button to Textfiled itself to mask it and see it using eye icon.