Refactored sections 3, 4, 5 in Req Spec doc

Section 3
	* Fleshed out airplane scene with its components
	* Fleshed out press conference scene, with its components

Section 4
	* Made components more specific to how they're used in each scene
	* Fixed formatting

Section 5
	* Detailed more how general components are used
	* Removed stretch goals from base requirements

Added stretch goals to featuresList doc