Add discussion of LQG to Chapter 8 [outputfbk]

[Richard Murray]

Richard will add some subsections in the Section 8.5 (Kalman filtering) titled something like “discrete time filtering”, “continuous time filtering”, and “optimal estimation and control” (LQG) as a first cut. I’ll likely leave the LQR material in Chapter 7 (state feedback) for now, since it can stand on its own in the case when you have full state information (which is the emphasis in Chapter 7).

[Richard Murray]

First cut was done in commit 7ef935f (by Karl). Additional subsections added in commit 4074a69.

[Richard Murray]

RMM: add subsection for discrete-time KF in Chapter 8 (outputfbk); see issue #11

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