[evita] views: Set correct bounds to |ui::TableControl| at realization.
Fix #16
[evita] ui: Get rid of redundnat member function |ui::Widget::Realize(gfx::RectF)|.
[evita] views: Place form window at center of foreground window rather than active |Frame|.
[evita] ui/controls: Make mouse drag to select text in find dialog box by introducing |gfx::Canvas::SetOrigin()| to make controls to work in local window coordinate rather than canvas owner's coordinate.
[evita] gfx: Tidying up |gfx::Canvas|.