Layout issues: Fix the layout ugliness on Mac & Linux

I seem to have found a sane way to create layouts:
If it's the 'outer' layout, the one that encapsulates everything:
- Horizontal Spacing: 5
- Vertical Spacing: 5

If it's a vertical inner layout that is grouping items like label +
control:
- Spacing: 0
This way the label will be 'touching' the item, without empty space, so
you know that the label refers to that widget.

If it's an horizontal inner layout:
- Spacing: 5
Different from the Vertical Layout, we don't want to make horizontal items
touch each other, a bit of space is fundamental to the eyes.

If it's a Grid Layout:
- Vertical Space: 0
- Horizontal Space: 5

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/mainwindow.ui

@@ -15,6 +15,18 @@
     <property name="spacing">
      <number>0</number>
     </property>
+    <property name="leftMargin">
+     <number>0</number>
+    </property>
+    <property name="topMargin">
+     <number>0</number>
+    </property>
+    <property name="rightMargin">
+     <number>0</number>
+    </property>
+    <property name="bottomMargin">
+     <number>0</number>
+    </property>
     <item>
      <widget class="MultiFilter" name="multiFilter" native="true"/>
     </item>
@@ -243,7 +255,7 @@
   </action>
   <action name="actionEditDeviceNames">
    <property name="text">
-    <string>&amp;Edit device names</string>
+    <string>Edit device &amp;names</string>
    </property>
   </action>
   <action name="actionAddDive">
@@ -699,7 +711,7 @@
   </action>
   <action name="actionHash_images">
    <property name="text">
-    <string>Find moved images</string>
+    <string>&amp;Find moved images</string>
    </property>
   </action>
  </widget>