* Added BORLAND target to several CMakeLists.txt.
(MSVC and BORLAND require similar behaviour for imports/exports)
* Added __BORLAND__ ifdefs where needed.
* Added scl_export.h with conditional flags for import/export.
* Added SCL_EXPRESS_EXPORT flag for all global variables in headers.
* Added SCL_EXPRESS_EXPORT flag for all function prototypes in headers.
* Added SCL_EXPRESS_DLL_EXPORTS flag for express CMakeLists.txt