+ Added feature for toggleable roll, now you can roll while you're standing!

+ Added keybind for toggleable roll (not during sprint + crouch combo or roll while crouching features)

+ Added the ability to enable/disable the toggleable roll feature

Note: Thank you for OpheliaSarah for indirectly suggesting this, although he/she was asking for a dynamic, changeable keybind for sprint + crouch combo or roll while crouching features -which I will not touch that cause that's how it originally works- , however, his/her suggestion sparked an idea for this specific feature

+ Added temporary invincibility frames (i-frame) feature, suggested by @Jane on the comment section
+ Added an toggleable checkbox/button for temporary invincibility frames (i-frame) while/during rolling
+ Added *a very subtle effect* if invincibility frames (i-frame) is enabled (this comes with a toggleable checkbox/button)

Notes:

1. If your player model is large, dark, or glowing already (like some custom skins), the halo might blend in or be hard to see.

2. If a player disables halos via a client-side setting or uses mat_fullbright 1, it may not render.

3. The roll_iframex convar must be 1 for it to work — otherwise, it’s silently disabled.