(core) move client code to core

Summary:
This moves all client code to core, and makes minimal fix-ups to
get grist and grist-core to compile correctly.  The client works
in core, but I'm leaving clean-up around the build and bundles to
follow-up.

Test Plan: existing tests pass; server-dev bundle looks sane

Reviewers: dsagal

Reviewed By: dsagal

Differential Revision: https://phab.getgrist.com/D2627

app/client/lib/chartUtil.ts

@@ -0,0 +1,20 @@
+import {typedCompare} from 'app/common/SortFunc';
+import {Datum} from 'plotly.js';
+
+/**
+ * Sort all values in a list of series according to the values in the first one.
+ */
+export function sortByXValues(series: Array<{values: Datum[]}>): void {
+  // The order of points matters for graph types that connect points with lines: the lines are
+  // drawn in order in which the points appear in the data. For the chart types we support, it
+  // only makes sense to keep the points sorted. (The only downside is that Grist line charts can
+  // no longer produce arbitrary line drawings.)
+  if (!series[0]) { return; }
+  const xValues = series[0].values;
+  const indices = xValues.map((val, i) => i);
+  indices.sort((a, b) => typedCompare(xValues[a], xValues[b]));
+  for (const s of series) {
+    const values = s.values;
+    s.values = indices.map((i) => values[i]);
+  }
+}