Map symbols to ASCII

I. Lvg Command:

shell> lvg -f:q0 -F:1:2

II. Test Cases:

“Quote”|"Quote"
«Doube Angle quote»|"Doube Angle quote"
´|'
÷|/
ǃ|!
̀accent́|`accent'
˜|~
̃|~
∼|~
≤|<=
≥|>=
〜|~