Bug 491556 - [Welcome] Provide theme-specific mechanism to influence path resolution

Add support for resolving theme-specific files.  When resolving a
file path, the Intro first checks for a file under a path with the
theme-id.  For example, resolving 'intro-eclipse.png' ->
'org.eclipse.ui.intro.universal.solstice/intro-eclipse.png'.

Change-Id: I8f558a4c264fb459efe0dbaeed7f92aaa980fb09
2 files changed