Various Fixes

[elcritch]

• add alternative as syntax for new widgets, e.g. Button[int] as "plusBtn"
• fix textbox's box not being updated from the UI nodes
• fix hAlign and vAlign argument plumbing for Input and Textboxes
• add helpers in Input for setting font color, vertical/horiz alignments
• add inline vertical and horizontal layout helpers
• update binding using Sigils new Sigil[T] reactive type