COMMON: Remove the need for most reflecting when initing reflected table

Instead reflect the polynomial and change the shifts. Also removes the
need for explicit init.

This makes our crc more similar to its standard implementation

common/unzip.cpp

@@ -1000,7 +1000,6 @@ public:
 
 ZipArchive::ZipArchive(unzFile zipFile) : _zipFile(zipFile), _crc() {
 	assert(_zipFile);
-	_crc.init();
 }
 
 ZipArchive::~ZipArchive() {