Make Desktop application (so can also run even if don't have Eclipse)

This way, DevOps can use custom searchers to index log files for example and then use CASTLE to search
* Would not have Workspace searcher, since no workspace to index
* Would not have indexing functionality, since would just reference existing indexes
* Could still have custom settings for analyzer (#9)

Start by reviewing the existing Eclipse plugin entry points and how custom searchers, existing indexes, and analyzer settings are handled. Define the standalone desktop application's boundaries, including the lack of workspace search and indexing, and verify that custom searchers can index log files and query existing indexes.

Written by the indexing model from the issue text.