tmaps: use go generate

Use go generate to produce the gomobile outputs and the Dart proto files. This mostly obsoletes the BUILD.md file, so what's still needed is folded into README.md under "Development / Build the Mobile App". This partly resolves #4; there is still a failure when attempting to build the mobile app.
google · Aug 3, 2020 · c2f46b1 · c2f46b1
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diff --git a/BUILD.md b/BUILD.md
diff --git a/README.md b/README.md
@@ -109,6 +109,18 @@ Code paths:
 This repository comes with a Git pre-commit hook in `./githooks`. Install it:
 `cp ./githooks/pre-commit .git/hooks/pre-commit`.
 
+### Build the Mobile App
+
+First, you'll need a build environment:
+
+*   Install [Flutter](https://flutter.dev/docs/get-started/install).
+*   Install [gomobile](https://golang.org/x/mobile/cmd/gomobile).
+
+Then, generate the intermediate binaries from the `tmaps/mobileapi` package:
+
+    go generate -tags android ./tmaps/mobileapi
+    go generate -tags ios ./tmaps/mobileapi
+
 ### Source Code Headers
 
 Every file containing source code must include copyright and license