Whitespace before/after the dot in a methodcall is disallowed

[whiteknight]

From a tangential discussion at RT #57656.

IMCC currently allows the following syntax forms:

foo. bar()
foo .bar()

Notice the whitespace before and after the dot in the method call. These should be disallowed: No whitespace should be allowed before or after the dot in the method call. This helps to differentiate it from the dot as a concatenation operator.

[coke]

The current syntax should probably be setup to warn asap, before removal.