Rename to Zec Wallet (#117)

* Update linux name

* Rename strings

* Rename debian/linux packages

* Rename windows build/installer

* Mac rename

* Update icon

* Update windows icon

* update background

* Prevent deleting utxos and balances while updating

src/mainwindow.ui

@@ -11,7 +11,7 @@
    </rect>
   </property>
   <property name="windowTitle">
-   <string>zec-qt-wallet</string>
+   <string>ZecWallet</string>
   </property>
   <property name="windowIcon">
    <iconset resource="../application.qrc">