v0.4.7

• Merge with the excellent preflate library to support recompression of all zLib streams - thanks to Dirk Steinke
• Support lzma filters (-lf) for improved compression of executables, audio and structured data (issue #75)
• Support for zLib streams larger than 2 GB (see issue #65)
• Changed to CMake for easier builds
• Fixed crashes when running multiple instances of Precomp in the same directory (see issue #87)
• Corrected -pdfbmp statistics (see issue #27)
• Discard insufficient partial bZip2 matches (see commit 138c107) - thanks to Gonzalo Muñoz
• Several minor bugs and memory leaks fixed (thanks to Gonzalo Muñoz and Dirk Steinke)