Support String Templates

[anthonyvdotbe]

Formatting a source file with String Templates:

class Foo {

    private static final int X = 42;
    private static final String Y = STR."\{X} = \{X}";

}

gives:

Foo.java:4:45: error: did not generate token "."

[anthonyvdotbe]

In essence this is a duplicate of #973, though that one is specifically reported against the IntelliJ plugin and labeled as such.