* moved JSON read writes to database.js

+ show commutative price and price per etho
+ use Roboto as the default font
+ use subscribe for new blocks to sync transactions better

renderer/database.js

@@ -0,0 +1,63 @@
+// In renderer process (web page).
+const {ipcRenderer} = require('electron');
+
+class Datatabse {
+    constructor() {}
+
+    getCounters() {
+        var counters = ipcRenderer.sendSync('getJSONFile', 'counters.json');
+
+        if (counters == null) {
+            counters = {};    
+        }
+
+        return counters;
+    }
+
+    setCounters(counters) {
+        ipcRenderer.sendSync('setJSONFile', 
+        { 
+            file: 'counters.json',
+            data: counters
+        });        
+    }
+
+    getWallets() {
+        var wallets = ipcRenderer.sendSync('getJSONFile', 'wallets.json');
+
+        if (!wallets) {
+          wallets = { names: {} };
+        }
+  
+        return wallets;
+    }
+
+    setWallets(wallets) {
+        ipcRenderer.sendSync('setJSONFile', 
+        { 
+            file: 'wallets.json',
+            data: wallets
+        });        
+    }
+
+    getAddresses() {
+        var addressBook = ipcRenderer.sendSync('getJSONFile', 'addresses.json');
+
+        if (!addressBook) {
+          addressBook = { names: {} };
+        }
+      
+        return addressBook;
+    }
+
+    setAddresses(addresses) {
+        ipcRenderer.sendSync('setJSONFile', 
+        { 
+            file: 'addresses.json',
+            data: addresses
+        });        
+    }
+}
+          
+// create new account variable
+EthoDatatabse = new Datatabse();