[WIP] Writing class documents.

There are already many classes.

- [x] appledoc settings.
- [ ] basic classes of data model
    - [ ] TBTableData
    - [ ] TBTableDataSection
    - [ ] TBTableDataRow
    - [ ] TBTableDataContext and its derived classes.
- [ ] section model
    - [ ] TBSingleChoiceSection
- [ ] row models
    - [ ] TBActionRow
    - [ ] TBButtonRow
    - [ ] TBCheckRow
    - [ ] TBChoiceRow
    - [ ] TBLabelRow
    - [ ] TBNavigationRow
    - [ ] TBSingleChoiceNavigationRow
    - [ ] TBSwitchRow
    - [ ] TBTextFieldRow
- [ ] cells
    - [ ] TBTableViewCell
    - [ ] TBUntappableCell
    - [ ] TBButtonTableViewCell
    - [ ] TBLabelTableViewCell
    - [ ] TBSwitchTableViewCell
    - [ ] TBTextFieldTableViewCell
- [ ] utilities
    - [ ] TBTableDataBuildHelper
    - [ ] TBTableViewController