Deprecated the codeComplete.substringMatch preference and enabled it by
default.
As a fallback it can be disabled with the system property
-Djdt.codeCompleteSubstringMatch=false


Change-Id: I7b4e8b2a0090af93015e9042a5808d9b3ce7eb27
Signed-off-by: Julian Honnen <julian.honnen@vector.com>