Pyflyt

Fixes 29, for real this time.

- Added `flight_mode` kwarg to all Gymnasium environments.
- Added more typehints to various functions to ease development.

Bug Fix

This release fixes a blatant error in the drag update equation for `boring bodies` ([link](https://github.com/jjshoots/PyFlyt/commit/62bdeb2cd5d0135af101d0b12cd59ba171b484d4)).

Changes
* Fix None error in obj_collision function by Yamboy1 in https://github.com/jjshoots/PyFlyt/pull/19

Minor bug fixes.

Added dogfight env.