0.6.2

• Added an optional Regular Expression that can be tested against a String field in an Entity. Any unmatched character in a string value will just be discarded. This allows the creation of custom field type (that needs to follow some specific pattern), while still having a safety net (the editor cleans up invalid parts).
• Fixed missing “world grid size” inputs in Grid Vania layouts. They should now appear in the World panel.
• Fixed level creation in “Linear” world layouts that only contain 1 level
• Fixed loading of null multiline fields
• Fixed a crash on layer removal
• Added “internal” (ie. “only for editor use”) indicator for undocumented fields in Json
• Fixed Json doc typo
• Fixed Travis unit tests
• Fixed new level creation in “Linear” layouts that only contained 1 level
• Minor changes & fixes on Home and Support pages