Support U+22C5 ⋅ DOT OPERATOR for multiplication

[Helder Correia]

Very useful:

1) when pasting from math-related websites into the editor

2) for separating composed units (e.g. 2 kilo gram as 2 kilo⋅gram)

3) for separating constants followed by variables, functions or units (e.g. 3 sin(pi) + 4b as 3⋅sin(pi) + 4⋅b)

[Helder Correia]

Support U+22C5 ⋅ DOT OPERATOR for multiplication. Fix #682

Very useful: 1) when pasting from math-related websites into the editor 2) for separating composed units (e.g. 2 kilo gram as 2 kilo⋅gram) 3) for separating constants followed by variables, functions or units (e.g. 3 sin(pi) + 4b as 3⋅sin(pi) + 4⋅b)

→ <<cset 2ecb70b70437>>