Add zoom level keybinds

assets/opensb/binds/opensb.binds

@@ -1,8 +1,26 @@
 {
   "opensb": {
-    "name": "OpenStarbound",
-    "bannerName" : "Open^#ebd74a;Starbound",
+    "groups": {
+      "camera": { "name": "Camera" }
+    },
+    "name": "Open^#ebd74a;Starbound",
     "binds": {
+      "zoomIn": {
+        "default": [{
+          "type": "key",
+          "value": "="
+        }],
+        "group" : "camera",
+        "name": "Zoom In"
+      },
+      "zoomOut": {
+        "default": [{
+          "type": "key",
+          "value": "-"
+        }],
+        "group" : "camera",
+        "name": "Zoom Out"
+      },
       "test": {
         "default": [{
           "type": "key",

source/client/StarClientApplication.cpp

@@ -315,6 +315,18 @@ void ClientApplication::processInput(InputEvent const& event) {
   }
 
   m_input->handleInput(event, processed);
+  WorldCamera& camera = m_worldPainter->camera();
+
+  auto config = m_root->configuration();
+  int zoomOffset = 0;
+
+  if (auto presses = m_input->bindDown("opensb", "zoomIn"))
+    zoomOffset += *presses;
+  if (auto presses = m_input->bindDown("opensb", "zoomOut"))
+    zoomOffset -= *presses;
+
+  if (zoomOffset != 0)
+    config->set("zoomLevel", max(1.0f, round(config->get("zoomLevel").toFloat() + zoomOffset)));
 }
 
 void ClientApplication::update() {