Windows full build improvements: break BuildDeps and BuildDepsX64 down into Debug, RelWithDebInfo and Release and MinSizeRel variants. This allows better control for the wanted build configuration. Halves the initial deps build time for a fresh repository checkout.
BuildDeps.cmd: run Qt configure each time as we're now building debug and release separately.
ArchivePlugin/CMakeLists.txt: search also for debug versions of zlibs.
BuildDeps.cmd: make sure to delete Qt's configure.cache. Simply running configure without deleting the cache file doesn't seem to work that well.
Update README.md to reflect the current Windows build configuration possibilities.
Merge remote-tracking branch 'remotes/origin/admino_tundra' into admino_win_fullbuild_improvements

Conflicts:
	tools/Windows/BuildDeps.cmd
BuildDeps.cmd: fix check whether or not to build AssImp. Build Ogre deps from https://bitbucket.org/cabalistic/ogredeps instead of using the zip package. Fix zziplib release build + do not call VCUpgrade if project file already upgraded.
BuildDeps.cmd: deploy all DLLs at each run. Print the used build type in info prints. Fix libspeexdsp output file check. Build either release or debug QtScript bindings upon single run.
Break QtScriptGenerator build into two parts (generator + qtbindings). Typo fixes. Fix copy of 32-bit celt lib.
BuildDeps.cmd: Deploy QtScript binding plugin DLLs always at each run.
BuildDeps.cmd: make sure that right version (x86 or x64) gets deployed to Tundra's bin.
BuildDeps.cmd: use variable for specifying the used OpenSLL version.
BuildDeps.cmd: Build debug or release QtScript binding plugins.
BuildDeps.cmd: fix check for libspeexdsp.lib existence. Fix warning for making a directory which already exists.
Use DEBUG_OR_RELEASE_LOWERCASE instead of DEBUG_OR_RELEASE for qtbinding nmake/jom invocation.
BuildDeps.cmd: clear CMake caches if CMake generator is different from the previous run.
BuildDeps.cmd: Tweak comment.
Merge remote-tracking branch 'remotes/origin/admino_tundra' into admino_win_fullbuild_improvements

Conflicts:
	tools/Windows/BuildDeps.cmd
BuildDeps.cmd: print warning in the beginning if MinSizeRel is used.
Merge pull request #6 from Adminotech/admino_win_fullbuild_improvements

Windows full build improvements