Autoloader function

Autoloads classes. Caches known paths do classes files.
.htaccess for default cache directory
New autoloading strategy

At the beginning well known paths are checked, then cache file and at
the end LIB_DIR.
Autoload function moved to separate file
Autoloader file
LMSDB_common as abtstract class
Database access layer and database driver interfaces
LMSDB_common and drivers implementation with interfaces.
LMSDB driver classes documentation
DBInit function replaced by LMSDB class
Getter for LMSDB version property
Getter for LMSDB revision.
Getter for LMSDB load state.
Getter for LMSDB dbtype.
Getter for LMSDB link.
Changes visibility of some properties in LMSDB_common class
Getter for LMSDB result.
Getter and setter for LMSDB errors.
Setter for LMSDB debug flag.
Update for LMSDVBInterface