Rewrite AmplitudeDisplay to compute a quality metric instead of a pas…

…s/fail on incoherence

- Pick largest vector component conditioned on other qubits, then dot product it onto all cases and add up the norms
- Add Shaders.sumFoldFloatAdjacents
- Add Shaders.floatData
- Fix arrayPowerSizeOfTexture going below 0 causing all sim output to be lost
- Fix cycleAllBitsFloat using vec2 instead of float when checking texture size

src/circuit/GateShaders.js

@@ -164,7 +164,7 @@ const CYCLE_ALL_SHADER_VEC2 = makePseudoShaderWithInputsAndOutputAndCode(
  * @returns {!WglConfiguredShader}
  */
 GateShaders.cycleAllBitsFloat = (inputTexture, shiftAmount) => {
-    let size = currentShaderCoder().vec2.arrayPowerSizeOfTexture(inputTexture);
+    let size = currentShaderCoder().float.arrayPowerSizeOfTexture(inputTexture);
     return CYCLE_ALL_SHADER_FLOAT(
         inputTexture,
         WglArg.float("shiftAmount", 1 << Util.properMod(-shiftAmount, size)));