[evita] editor: Move class |Application| into |namespace editor|.
[base] Disable warning 4625 and 4626.
[build] Disable C++ warning level 3 C4738 storing 32-bit float result in memory, possible loss of performance
[evita] editor: Tidy up "evita/editor/application.{cc,h}"
[evita] ui/animation: Tidy up "evita/ui/animation/animation_scheduler.cc".
[evita] views: Simplify |views::TextWindow| rendering.