Enabled native x64 compilation on Windows

* Updated CMakeLists to support x64 compilation on Windows
* Updated platform detection function call to allow 64bit Windows to be recognized
Updated Windows README

Nuwen's MinGW does not support 32-bit anymore, clang 3.4 does not seem to work
with MinGW and Boost...
Added icon for Mozart launcher on Windows

Just to give the shortcuts a better look...
Package icons and dependencies for Linux

* Added icons and desktop shortcuts for Linux
* Added lines for dependencies (may be modified by the packager) for DEB and
RPM packages
Added InnoSetup files

* Retrieved ModifyPath.iss from Mozart 1 repo and updated it
* Added main Inno Setup script with batch file to check Tcl version
Fixed various typos and InnoSetup helper functions

* Fixed typos and ensured there's an EOL at end of files
* Removed Win9x functions in Inno Setup files as this is not supported
anymore
* Improved code quality of Inno Setup files
Integrated Inno Setup process with CMake

* Added separated iss file for configuration
* Inno Setup configuration is now computed at CMake time
* Added make installer target on Windows to launch the process
* Updated Windows README to include setup making notice