Bug 429521 - make welcome screen graphics/color consistent with new logo

Commit for "what's new" and "migrate" icons. 
(And, I removed the 'gif' versions what were replaced by 'png' images). 

diff --git a/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48.gif b/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48.gif
deleted file mode 100644
index f6fa59f..0000000
--- a/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48.gif
+++ /dev/null
Binary files differ
diff --git a/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48.png b/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48.png
new file mode 100644
index 0000000..681500c
--- /dev/null
+++ b/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48.png
Binary files differ
diff --git a/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48_hov.gif b/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48_hov.gif
deleted file mode 100644
index 8624fc1..0000000
--- a/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48_hov.gif
+++ /dev/null
Binary files differ
diff --git a/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48_hov.png b/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48_hov.png
new file mode 100644
index 0000000..06bb467
--- /dev/null
+++ b/platform/org.eclipse.platform/images/topiclabel/wn_eclplatform48_hov.png
Binary files differ
diff --git a/platform/org.eclipse.platform/intro/css/migrate.css b/platform/org.eclipse.platform/intro/css/migrate.css
index 3ceb6a0..b579333 100644
--- a/platform/org.eclipse.platform/intro/css/migrate.css
+++ b/platform/org.eclipse.platform/intro/css/migrate.css
@@ -1,2 +1,2 @@
-a#platform img { background-image : url('../../images/topiclabel/wn_eclplatform48.gif'); }
-a#platform:hover img { background-image : url('../../images/topiclabel/wn_eclplatform48.gif'); }
+a#platform img { background-image : url('../../images/topiclabel/wn_eclplatform48.png'); }
+a#platform:hover img { background-image : url('../../images/topiclabel/wn_eclplatform48_hov.png'); }
diff --git a/platform/org.eclipse.platform/intro/css/migrate.properties b/platform/org.eclipse.platform/intro/css/migrate.properties
index 76168ba..c1ea8fd 100644
--- a/platform/org.eclipse.platform/intro/css/migrate.properties
+++ b/platform/org.eclipse.platform/intro/css/migrate.properties
@@ -8,5 +8,5 @@
 # Contributors:
 #     IBM Corporation - initial API and implementation
 ###############################################################################
-migrate.platform.link-icon = images/topiclabel/wn_eclplatform48.gif
-migrate.platform.hover-icon = images/topiclabel/wn_eclplatform48.gif
+migrate.platform.link-icon = images/topiclabel/wn_eclplatform48.png
+migrate.platform.hover-icon = images/topiclabel/wn_eclplatform48_hov.png
diff --git a/platform/org.eclipse.platform/intro/css/whatsnew.css b/platform/org.eclipse.platform/intro/css/whatsnew.css
index 5515caa..a417e90 100644
--- a/platform/org.eclipse.platform/intro/css/whatsnew.css
+++ b/platform/org.eclipse.platform/intro/css/whatsnew.css
@@ -1,6 +1,6 @@
 
-a#platform-noteworthy img { background-image : url(../../images/topiclabel/wn_eclplatform48.gif); }
-a#platform-noteworthy:hover img { background-image : url(../../images/topiclabel/wn_eclplatform48_hov.gif); }
+a#platform-noteworthy img { background-image : url(../../images/topiclabel/wn_eclplatform48.png); }
+a#platform-noteworthy:hover img { background-image : url(../../images/topiclabel/wn_eclplatform48_hov.png); }
 
 a#updates img { background-image : url(../../images/topiclabel/wn_updates48.gif); }
 a#updates:hover img { background-image : url(../../images/topiclabel/wn_updates48_hov.gif); }
diff --git a/platform/org.eclipse.platform/intro/css/whatsnew.properties b/platform/org.eclipse.platform/intro/css/whatsnew.properties
index 34b0f1c..e49aa59 100644
--- a/platform/org.eclipse.platform/intro/css/whatsnew.properties
+++ b/platform/org.eclipse.platform/intro/css/whatsnew.properties
@@ -9,8 +9,8 @@
 #     IBM Corporation - initial API and implementation
 ###############################################################################
 
-whatsnew.platform-noteworthy.link-icon = images/topiclabel/wn_eclplatform48.gif
-whatsnew.platform-noteworthy.hover-icon = images/topiclabel/wn_eclplatform48_hov.gif
+whatsnew.platform-noteworthy.link-icon = images/topiclabel/wn_eclplatform48.png
+whatsnew.platform-noteworthy.hover-icon = images/topiclabel/wn_eclplatform48_hov.png
 
 whatsnew.updates.link-icon = images/topiclabel/wn_updates48.gif
 whatsnew.updates.hover-icon = images/topiclabel/wn_updates48_hov.gif