refs #755, mapping UI improvements

* make drop area more obvious by icon and color
* improve forms so the layout looks better on large screens
* button to display model dialog (like distributor, ICAO, ...)

src/blackgui/editors/aircrafticaoform.ui

@@ -7,13 +7,13 @@
     <x>0</x>
     <y>0</y>
     <width>402</width>
-    <height>241</height>
+    <height>271</height>
    </rect>
   </property>
   <property name="minimumSize">
    <size>
     <width>0</width>
-    <height>220</height>
+    <height>225</height>
    </size>
   </property>
   <property name="windowTitle">
@@ -40,7 +40,7 @@
      <property name="title">
       <string>Aircraft ICAO</string>
      </property>
-     <layout class="QGridLayout" name="gl_AircraftIcao">
+     <layout class="QGridLayout" name="gl_AircraftIcao" columnstretch="0,1,0">
       <item row="1" column="1">
        <widget class="QWidget" name="wi_DesignatorRank" native="true">
         <layout class="QHBoxLayout" name="hl_DesignatorRank">

src/blackgui/editors/airlineicaoform.ui

@@ -40,7 +40,7 @@
      <property name="title">
       <string>Airline ICAO</string>
      </property>
-     <layout class="QGridLayout" name="gl_AirlineIcao">
+     <layout class="QGridLayout" name="gl_AirlineIcao" columnstretch="0,1,0">
       <item row="5" column="1">
        <widget class="QWidget" name="wi_Timestamps" native="true">
         <layout class="QHBoxLayout" name="hl_Timestamps">

src/blackgui/editors/distributorform.ui

@@ -6,14 +6,14 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>299</width>
-    <height>175</height>
+    <width>297</width>
+    <height>200</height>
    </rect>
   </property>
   <property name="minimumSize">
    <size>
     <width>0</width>
-    <height>175</height>
+    <height>185</height>
    </size>
   </property>
   <property name="windowTitle">
@@ -40,7 +40,7 @@
      <property name="title">
       <string>Distributor</string>
      </property>
-     <layout class="QGridLayout" name="gl_Distributor">
+     <layout class="QGridLayout" name="gl_Distributor" columnstretch="0,1,1,0">
       <item row="2" column="1">
        <widget class="QLineEdit" name="le_Alias1">
         <property name="placeholderText">

src/blackgui/editors/liveryform.ui

@@ -2,14 +2,6 @@
 <ui version="4.0">
  <class>CLiveryForm</class>
  <widget class="QFrame" name="CLiveryForm">
-  <property name="geometry">
-   <rect>
-    <x>0</x>
-    <y>0</y>
-    <width>361</width>
-    <height>422</height>
-   </rect>
-  </property>
   <property name="windowTitle">
    <string>Livery editor</string>
   </property>
@@ -34,7 +26,7 @@
      <property name="title">
       <string>Livery</string>
      </property>
-     <layout class="QGridLayout" name="gl_Livery">
+     <layout class="QGridLayout" name="gl_Livery" columnstretch="0,1,1,1,0">
       <item row="4" column="0">
        <widget class="QLabel" name="lbl_Timestamp">
         <property name="text">
@@ -140,14 +132,7 @@
        </widget>
       </item>
       <item row="0" column="0">
-       <widget class="BlackGui::CLabelAndIcon" name="lai_Id">
-        <property name="frameShape">
-         <enum>QFrame::StyledPanel</enum>
-        </property>
-        <property name="frameShadow">
-         <enum>QFrame::Raised</enum>
-        </property>
-       </widget>
+       <widget class="BlackGui::CLabelAndIcon" name="lai_Id"/>
       </item>
       <item row="6" column="0" colspan="4">
        <widget class="BlackGui::Editors::CAirlineIcaoForm" name="editor_AirlineIcao">