Added basic support for multi-line comments in properties files via C-style /* and */.
Merge pull request #1135 from sgrenier/next

Multi-line comment support for properties files
Moved AnimationTarget::getPropertyId to a protected function so that devs can make their own Property IDs, or use the existing ones
Merge pull request #1131 from reven86/next-clean

Bugfixes
Merge pull request #1141 from rcmaniac25/helpful-additions-animation_property_id

Customizable Animation properties
align controls only if alignment is set
reset total width and height of Container before their calculation
take control's margin into account during Container total width/height calculation
scrollbar's position can be controlled from code and scripts