RFR: JDK-8214139: Remove wrapper methods from {Base,Html}Configuration

[Jonathan Gibbons]

Please review a conceptually simple cleanup for the doclet code.

The change is:

  * replace all uses of all overloads of Configuration.getText with the
    underlying implementation of Resources.getText
  * replace all uses of all overloads of Configuration.getContent with
    the underlying implementation of Contents.getContent
  * remove all overloads of Configuration.getText
  * remove all overloads of Configuration.getContent

The change is mostly mechanical, via an IDE, with some minor manual 
fixup. The most notable manual change is to defer initializing Extern so 
that we can cache Configuration.getResources.

The changes are all very localized, so it may be easy to read the 
overall patch, or the Udiffs in the webrev than the side-by-side diffs.

noreg-cleanup, so no tests. All the tests still pass, and "make docs" is 
the same before and after.

JBS: https://bugs.openjdk.java.net/browse/JDK-8214139
Webrev: http://cr.openjdk.java.net/~jjg/8214139/webrev.00/

-- Jon

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