Doc: Add dependency build scripts and building how-tos

doc/How to build - Windows.md

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+# Building Slic3r PE on Microsoft Windows
+
+The currently supported way of building Slic3r PE on Windows is with MS Visual Studio 2013
+using our Perl binary distribution (compiled from official Perl sources).
+You can use the free [Visual Studio 2013 Community Edition](https://www.visualstudio.com/vs/older-downloads/).
+
+Other setups (such as mingw + Strawberry Perl) _may_ work, but we cannot guarantee this will work
+and cannot provide guidance.
+
+
+### Geting the dependencies
+
+First, download and upnack our Perl + wxWidgets binary distribution:
+
+  - 32 bit, release mode: [wperl32-5.24.0-2018-03-02.7z](https://bintray.com/vojtechkral/Slic3r-PE/download_file?file_path=wperl32-5.24.0-2018-03-02.7z)
+  - 64 bit, release mode: [wperl64-5.24.0-2018-03-02.7z](https://bintray.com/vojtechkral/Slic3r-PE/download_file?file_path=wperl64-5.24.0-2018-03-02.7z)
+  - 64 bit, release mode + debug symbols: [wperl64d-5.24.0-2018-03-02.7z](https://bintray.com/vojtechkral/Slic3r-PE/download_file?file_path=wperl64d-5.24.0-2018-03-02.7z)
+
+It is recommended to unpack this package into `C:\`.
+
+Apart from wxWidgets and Perl, you will also need additional dependencies:
+
+  - Boost
+  - Intel TBB
+  - libcurl
+
+We have prepared a binary package of the listed libraries:
+
+  - 32 bit: [slic3r-destdir-32.7z](https://bintray.com/vojtechkral/Slic3r-PE/download_file?file_path=slic3r-destdir-32.7z)
+  - 64 bit: [slic3r-destdir-64.7z](https://bintray.com/vojtechkral/Slic3r-PE/download_file?file_path=slic3r-destdir-64.7z)
+
+It is recommended you unpack this package into `C:\local\` as the environment
+setup script expects it there.
+
+Alternatively you can also compile the additional dependencies yourself.
+There is a [powershell script](./deps-build/windows/slic3r-makedeps.ps1) which automates this process.
+
+### Building Slic3r PE
+
+Once the dependencies are set up in their respective locations,
+go to the `wperl*` directory extracted earlier and launch the `cmdline.lnk` file
+which opens a command line prompt with appropriate environment variables set up.
+
+In this command line, `cd` into the directory with Slic3r sources
+and use these commands to build the Slic3r from the command line:
+
+    perl Build.PL
+    perl Build.PL --gui
+    mkdir build
+    cd build
+    cmake .. -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Release
+    nmake
+    ctest --verbose    # TODO: ???
+    cd ..
+    perl slic3r.pl
+
+The above commands use `nmake` Makefiles.
+You may also build Slic3r PE with other build tools:
+
+
+### Building with Visual Studio
+
+To build, lanuch and/or debug Slic3r PE with Visual Studio (64 bits), replace the `cmake` command with:
+
+    cmake .. -G "Visual Studio 12 Win64" -DCMAKE_CONFIGURATION_TYPES=Release;RelWithDebInfo || exit /b
+
+For the 32-bit variant, use:
+
+    cmake .. -G "Visual Studio 12" -DCMAKE_CONFIGURATION_TYPES=Release;RelWithDebInfo || exit /b
+
+After `cmake` has finished, go to the `Slic3r\build` directory and open the `Slic3r.sln` solution file.
+This should open Visual Studio and load all the Slic3r solution containing all the projects.
+Make sure you use Visual Studio 2013 to open the solution.
+
+You can then use the usual Visual Studio controls to build Slic3r.
+If you want to run or debug Slic3r from within Visual Studio, make sure the `slic3r` project is activated.
+There are multiple projects in the Slic3r solution, but only the `slic3r` project is configured with the right
+commands to run Slic3r.
+
+
+### Building with ninja
+
+To use [Ninja](TODO), replace the `cmake` and `nmake` commands with:
+
+    cmake .. -G Ninja -DCMAKE_BUILD_TYPE=Release
+    ninja