feat: backend version based feature toggles

[theborakompanioni]

Resolves #637.

Using the new /getinfo endpoint to provide the ability to use backend version based feature toggles.
e.g. as "import wallet" feature will be available with JM v0.9.10, this enables hiding/disabling the button.

How to test

Change the port from the dev JM backend (port 28183) to the secondary JM backend (port 29183), which runs an older version. Restart the ui (npm run dev:start) and verify that the "Import Wallet" button is not displayed anymore.

diff --git a/src/setupProxy.js b/src/setupProxy.js
index 360592a..6cdcfa3 100644
--- a/src/setupProxy.js
+++ b/src/setupProxy.js
@@ -7,7 +7,7 @@ const SUPPORTED_BACKENDS = [BACKEND_NATIVE, BACKEND_STANDALONE]
 const {
   PUBLIC_URL = '',
   JAM_BACKEND = BACKEND_NATIVE,
-  JMWALLETD_API_PORT = '28183',
+  JMWALLETD_API_PORT = '29183',
   JMWALLETD_WEBSOCKET_PORT = '28283',
   JMOBWATCH_PORT = '62601',
   JAM_API_PORT = undefined,