Add catch all exception mapper for HTTP

Mapper logs the exception and request URI
Mapper returns the stacktrace a text/plain response
Add support for collection types to the verifier
Categorize errors for unsupported expressions
Fix SqlTypeByteCodeExpression

Previously it would fail for any type whose name was not a valid java
method name
Enable MaxBy tests for all types
Add support for Maps to verifier
Fix handling of unresolvable artifacts
Load plugins and construct classpath consistently