[Restructure] Reorganize files (No File edits)
[Restructure] Move skel.dat, rename NvTriStrip Wrapper
[Restructure] Modify include/source/resource paths

Updates files to reflect new directory structure.
[Restructure] Update docsys to one at Github
[Restructure] Remove hardcoded shader paths

Debug/release builds are hardcoded to expect the shaders folder in a
different path.  This is unnecessary as the new NifSkope.pro will put
the shaders with the EXE just like in the official install.
[Restructure] Remove docsys
[Restructure] Re-add docsys
[Restructure] Update LICENSE.TXT
[Restructure] Rename sfannounce.txt > README.md
[Restructure] Remove TODO.TXT in favor of tracker/wiki
[Restructure] Update README
[Restructure] Rename TXT files, create stubs
[Restructure] Move VERSION to /build
[Restructure] Add input file for README version
[Restructure] Move docsys
[Restructure] New Doxyfile.in
[Restructure] Initial .pro/.pri config modifications

Leaves the build directory in a perfect install state.  To make the NIF
docs, there is a "docs" makefile target.  To make the NifSkope API docs
there is a "doxygen" makefile target.
[Restructure] Doxygen improvements

Looks for qhgenerator.exe and dot (GraphViz).  GraphViz support is very
narrow right now... I'll fix it in the future.

If these programs are available the Doxyfile gets changed accordingly.
[Restructure] Minor .pro/.pri cleanup
[Restructure] Better sed support for Windows

Looks for Cygwin in addition to GnuWin32.  If neither are found it falls
back to looking for the executable using the `where` command.