modified default colors for visualEditor
- definitive move from CodeMirror to Ace
 this means : closes #84 and closes #105
 * indentation works correctly and in a readable manner
 * linting is integrated
 * changed editor settings to match those available/that make sense in Ace
 * added theme support for code editor (settable via settings menu) : closes #111
removed hierarchyEditor settings entry (was not needed), some slight css change to that editor as well
- fixes #112: shadows, including shadows of objects onto another are working correctly
 * also added settable shadow resolution (requires restart for now)
- updated THREE.js to R58, fixed some minor related changes in :
 * customOrbitControls (event dispatching)
 * renderer color/alpha clear settings
- Added a few helper files (not used yet) for future reference