Swing-based expression editor
* main class is the ExpressionEditor, in editor core tests
* supports both graphical editing (in tree) and textual editing (in textarea)
* required minor changes to Literals and VariableRef expression nodes
Bindings generation now includes newlines, for ease of diff
Merge pull request #393 from manuel-freire/bindings-with-newlines

Bindings generation now includes newlines, for ease of diff
Merge pull request #389 from manuel-freire/swing-expression-editor

Swing-based expression editor
Cleanup of GeometryUtils and associated tester programs
* split off SchemaGdxConverter (engine) from GeometryUtils (editor-only)
* added ShapeEditor as stand-alone test (split from TexturedShapeEditor)
* updated GeoTester to use offsets, draw strings when required
Added perspective-corrected path-finding for polygons
* PathUtils contains general utilities (eg.: projection matrix manipulation)
* PathFinder finds the paths, allows path-segment iteration
* PathFinderTest contains JUnit tests for above
* PathTester contains a graphical test
Engine integration for path-finding
 * Path transformed by PathProcessor into PathComponent: poly+perspective
 * Goto effect executed by GoToExecutor adds WalkComponent: actual walking
 * PathSystem updates positions of elements with active WalkComponents
 * Integrated into cooldemo: click on alien to walk him around
Changed handles appeareances with white border, so is visible in any context
Merge pull request #371 from manuel-freire/element-paths

Element paths
Add rotation step to have more control over rotations
eAdventure Mockup bugfixes and adjustments after the recent refactoring.
Merge pull request #396 from RotaruDan/adjustments

eAdventure Mockup bugfixes and adjustments after the recent refactoring.
Updated GameLoop to actually pool entities and components
Updated processors and system to use gameloop
Added test for game loop
Remove Entity Effect
Added test
Fixes bad height calculation on window resize in AbstractWidgetTest
* also adds an array of "status" messages, useful in writing graphical tests
Merge pull request #400 from manuel-freire/abstract-widget-fix

Fixes bad height calculation on window resize in AbstractWidgetTest
Fixing formatting broken after https://github.com/e-ucm/ead/pull/400/.
@manuel-freire, I think you'll also buy a round next friday :)