mwan3-luci: update to 1.3-5

 mwan3-luci: update to 1.3-5

new naming/wording - more generically mwan than mwan3
renamed cryptic variables/functions/etc everywhere
removed unused and unnecessary variables everywhere
cleaned up ugly and inefficient Lua and Javascript

Signed-off-by: Aedan Renner chipdankly@gmail.com