#3 Compile LNG when Saving changes

[Andrew K. Lovetski]

An option to compile the LNG file when the "Save
changes" function is invoked (that is when the user
presses "Save sources" menu item and when the program
is closed). The option should be On by default and
should be stored to INI file. A menu item for this
option should be put either into an Options menu or
straight to File menu.