[Version Control] Hide what's not API and seal most stuff.

The only thing left to do is sealing a demon. Or keeping me aaway from this.
[Test Results] Fix lots of assertion fails where fraction is not in [0, 1].

Maybe there is a better fix?
[Tests] Debugger tests now run on Windows!
[Debugger] Enable CorDebugger tests.
Merge pull request #422 from mono/debuggerTests

Enable CorDebugger tests
Merge pull request #421 from mono/testResultsPad

[Test Results] Fix lots of assertion fails where fraction is not in [0,1]
[Debugger] Fix tests to use correspondent runtime.
Merge pull request #420 from mono/fixAPI

[Version Control] Hide what's not API and seal most stuff.
[Debugger] Fix NRE in Debugger tests.
Bump guiunit to fix build on .NET 4.5.1

Conflicts:
	main/external/guiunit
Revert "Merge pull request #420 from mono/fixAPI"

This reverts commit fe0d6f373afb019f42ffc93cbd2c4e9cd2f4488a, reversing
changes made to dc227b8c6495c8e3d643fa2d0d4c863eeba415c7.

This will break every third party VCS addin and also our own VCS extensions
[build] Ensure configure/Makefile are always checked out as lf

They must be lf so they execute correctly.