Improved robustness of completion in cases where non-Java identifier
characters are included in input.

Signed-off-by: Timo Kinnunen <timo.kinnunen@gmail.com>
Improved speed of completion in some cases by skipping java.lang.Object
and its 11000+ subclasses, and in addition by limiting the number of
additional types being processed to an arbitrary number 100.

Signed-off-by: Timo Kinnunen <timo.kinnunen@gmail.com>