Silence boring Eclipse warnings: @SuppressWarnings("rawtypes")

Add @SuppressWarnings("rawtypes") to ResolverAdapter, since it has a comment
making pretty clear that using raw types is intended.
Silence boring Eclipse warnings: catching all exceptions

Here I make explicit where catching all exceptions is intended.
Mark Harrah corrected one decision during review.
Silence boring Eclipse warnings: catching all exceptions, part 2

These warning fixes are new since my last pull request, please verify.
Silence boring Eclipse warnings: feature warnings - take #2

Silencing boring warnings allows seeing the interesting ones. Here I've excluded
reflectiveCalls, since that's a useful warning.
However, silencing those warnings in *Eclipse* would require committing Eclipse
projects, something which *will* take extra effort; I verified that the warnings
disappeared from the output of compilation in SBT.
Enable Java -Xlint warnings, excluding serialization-related ones