Replace PODs with conventional CMake workflow

[jamiesnape]

Note: This is an epic on our ZenHub board. Please do not remove or rename the Epic label.

[david-german-tri]

Sorry about that. Done.

[jamiesnape]

For the benefit of non-ZenHub users, the initial list of issues in the epic was #1747, #1751, #1781, #1859, #1909, #1963, #1989, #1994, #2046, #2094, #2118, #2251, #2307, #2329, #2341, #245, #2483, #2484, #2486, and #2487.

[david-german-tri]

When you get a chance, could you generate a burndown list for PODs dependencies?

[jamiesnape]

Adding #3326, #3327, #3328, #3329, #3330, #3331, #3332, #3333, #3334, #3335, #3336, #3337, #3338, #3341, #3342, and #3347.

[david-german-tri]

See #1859 for some useful discussion and history.