Added search-index support for new models (instead of only-updates)
Moved test-i18n messages to separate folder;
fixed i18n test to match
Added a dependency to engine-desktop test-classes for editor testing
Moved teststyle into the hosting game, testgame.
Partially addresses #186
Incremental search, with tests.
Better indexing through scene-element recursion, image uris, term sanitatization
- images, atlases and ninepatches now have their URIs indexed
- notes are indexed (forgot to regenerate pojos in last commit)
- recursive processing of scene-elements; also looks into behaviors/effects
- more tests
- same processing (non-alphanumeric char removal) applied to indexable terms
  and to queries