Websocket Stream Stats & Robustness Improvements (#605)

* wip support for a stats overlay

* WIP adding stream stats. But.... eeeh. Corporate.

* kbits over mbytes

* A ton more tweaks:

- Increased thread priority for streaming to reduce "stutter/slow" issues
- revised client side URL creation order to prevent the possibility of repeat-identical URL's
- Improved overlay to only be visible on mouseover, and fully centered in the screen

* wpiformat on js

photon-client/src/views/PipelineView.vue

@@ -33,7 +33,7 @@
                 :color="fpsTooLow ? 'error' : 'transparent'"
                 :text-color="fpsTooLow ? 'white' : 'grey'"
               >
-                <span class="pr-1">{{ Math.round($store.state.pipelineResults.fps) }}&nbsp;FPS &ndash;</span>
+                <span class="pr-1">Processing @ {{ Math.round($store.state.pipelineResults.fps) }}&nbsp;FPS &ndash;</span>
                 <span v-if="!fpsTooLow">{{ Math.min(Math.round($store.state.pipelineResults.latency), 9999) }} ms latency</span>
                 <span v-else-if="!$store.getters.currentPipelineSettings.inputShouldShow">HSV thresholds are too broad; narrow them for better performance</span>
                 <span v-else>stop viewing the raw stream for better performance</span>