All kinds of incremental improvements

Redone the instance action toolbar:
* Removed all the dead actions
* Change icon and Rename are now morphed into a header
* Added button for opening the config folder
Implemented support for loose files and folders as legacy jar mods
Added texture pack support

gui/LegacyModEditDialog.ui

@@ -17,7 +17,7 @@
    <item>
     <widget class="QTabWidget" name="tabWidget">
      <property name="currentIndex">
-      <number>0</number>
+      <number>1</number>
      </property>
      <widget class="QWidget" name="jarTab">
       <attribute name="title">
@@ -261,7 +261,7 @@
    <item>
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="standardButtons">
-      <set>QDialogButtonBox::Close|QDialogButtonBox::Reset</set>
+      <set>QDialogButtonBox::Close</set>
      </property>
     </widget>
    </item>