[Lazarus] Embedded database for Lazarus/Linux

[brian]

> Even better regexp is:
> 
> ^Tnt(([^L]|L[^X]).*|L$)

Thanks.
In this case even my original regexp may be good enough. There are always many 
characters following "LX". This was a corner case anyway when trying to 
convert Tnt* 3rd party components to LCL fall-back components.

The fall-back rules system now works nicely. Replacements and regexp rules can 
be added and they are stored in a config file.

Juha