[DF-874] Added dialog to chose new value key/type. Fixed some issues.
[DF-185] Now using OptionalWidget to show colorDialog button in properties editor.
[DF-185] New icons for texture browser
[DF-874] ByteArray variant now isn't allowed. Last variant type remember
[DF-185] Recent opened files issue fixed
Merge branch 'development' of https://github.com/dava/dava.framework into development