Circleguard

* fix ReplayDir and ReplayCache double counting replays sometimes

* add several new ``Loadable`` convenience classes. ``ReplayCache`` for accessing random elements from a circlecore database, ``ReplayDir`` for folders of ``.osr`` files, and ``ReplayID`` for when you only know the replay id.

* correctly account for skips in replays

* don't reorder frames with the same time

* add a new replay stealing detect, `Detect.STEAL_CORR`, using signal processing cross-correlation methods
* rename `Detect.STEAL` to `Detect.STEAL_SIM`, with `Detect.STEAL` remaining as deprecated
* split `StealResult` into `StealResultSim` and `StealResultCorr`
* correctly order replay frames and remove invalid frames. This changes similarity values slightly
* add default cutoffs to `Detect` as `SIM_LIMIT` and `UR_LIMIT`. These are values we feel are enough to call a replay cheated. They are not used in our code but are provided as a convenience.
* don't remove frames with identical time values when processing replay data. This removal still occurrs, but only when the replays are investigated.

* loading replays from cache is now roughly twice as fast