Writing class documents.

This work will be a part of issue #3.
There are already many classes though.

- [x] appledoc settings.
- basic classes of data model
    - [x] TBTableData
    - [x] TBTableDataSection
    - [x] TBTableDataRow
    - [x] TBTableDataContext and its derived classes.
- section model
    - [x] TBSingleChoiceSection
- row models
    - [x] TBActionRow
    - [x] TBButtonRow
    - [x] TBCheckRow
    - [x] TBChoiceRow
    - [x] TBLabelRow
    - [x] TBNavigationRow
    - [x] TBSingleChoiceNavigationRow
    - [x] TBSwitchRow
    - [x] TBTextFieldRow
- cells
    - [x] TBTableViewCell
    - [x] TBUntappableCell
    - [x] TBButtonTableViewCell
    - [x] TBLabelTableViewCell
    - [x] TBSwitchTableViewCell
    - [x] TBTextFieldTableViewCell
- utilities
    - [x] TBTableDataBuildHelper
    - [x] TBTableViewController