Widgets: Value() helpers

Those marked with [O] are optional

  -- ImGui.Value(...)
  -- Parameters: text (prefix) bool/int/unsigned int/float (value), text (float_format) [O] -- format only available with float
  -- Overloads
  ImGui.Value("Prefix", true)
  ImGui.Value("Prefix", -5)
  ImGui.Value("Prefix", 5)
  ImGui.Value("Prefix", 5.0)
  ImGui.Value("Prefix", 5.0, "%.2f")