Default console font tweaks

* Lucida Console on Windows
* Menlo on OSX
* Monospace (resolved to whatever Monospace means) on linux
* Added ability to select proportional fonts in settings

gui/pages/global/MultiMCPage.ui

@@ -42,7 +42,7 @@
       <enum>QTabWidget::Rounded</enum>
      </property>
      <property name="currentIndex">
-      <number>1</number>
+      <number>0</number>
      </property>
      <widget class="QWidget" name="featuresTab">
       <attribute name="title">
@@ -383,9 +383,6 @@
               <verstretch>0</verstretch>
              </sizepolicy>
             </property>
-            <property name="fontFilters">
-             <set>QFontComboBox::MonospacedFonts</set>
-            </property>
            </widget>
           </item>
          </layout>