CMake build system for SQLite 3

I've created this build for Windows to produce static/dynamic libs.

The idea is simple:

• create folder where you want to build sqlite lib - let's call it sqlite_bld
• extract amalgamation sources from http://www.sqlite.org/download.html to sqlite_bld/src
• put this CMakeLists.txt to sqlite_bld
• create sqlite_bld/build and cd to this folder
• execute "cmake .." for default generator or add option "-G[generator you wish]"

TODO:

• Add NSIS/RPM(?)/DEB(?) CPack support
• Add tests (gtest?) for basic functionality validation
• Add control for more compilation options http://www.sqlite.org/compile.html