v0.7.0

Release version 0.7.0

### Added
- Forward perpendicular parking methods for `SlotPlanner`.
- Angle forward/backward parking.
- Multiple `firsts` points tested before random sampling.
- Dubins path steering procedure.

### Changed
- Parking slot in scenario starts with the point closest to the init pose.
- Fix and include perpendicular parking slot in *find init pose* method of
  SlotPlanner.
- In T2's next method, steer to multiple goals that are connected with goal.
- Normal distribution in sampling.
- Sampling info based on init pose find by `fip()` of SlotPlanner.
- Refactor Nearest Neighbor, remove unused files.
- Make sampling info scenario dependent.
- Scenario JSON format.

### Fixed
- IYI computation.