ImageOrColorPreviewManager now more low-level — high-level hint management moved to new EP com.intellij.elementPreviewProvider implementation ElementPreviewHintProvider

Now we can implement http://youtrack.jetbrains.com/issue/WEB-1799 (preview not only as hint, but any what you want and can imagine)

LveEdit impl of this new EP is initial.
Github: remove wrong dependency
Merge branch 'master' of git.labs.intellij.net:idea/community
Common VM options extracted
Typo