Bug #43 Custom picker: toolbar visibility

- BPUtils: time string from date
- BPSwitchCell: add subtitle
- BPSettingsAlarmViewController: display selected time
Task #15 Custom picker

- menstruation period support (BPValuePickerModeMenstruationPeriod mode)
Feature #44 My Profile: menstruation period support

- BPSettingsProfileViewController: display menstruation period
- BPTextField: number property (menstruation indicator value)