source: refactor source file handling

 - Move source object pointer into program entity which is referenced by
   each function

 - Move lineinfo related routines into source.c and use them from lexer.c
   since lineinfo encoding does not belong into the lexical analyzer.

 - Implement initial infrastructure for detecting source file type,
   this is required later to differentiate between plaintext and
   precompiled bytecode files

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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