Add include guard removal function
-lzip: Add symbols for #if evaluation
Remove #include dependency stuff, re-integrate filesys.bas
Recursively load #include files too
Remove include guard removal stuff again

it can aswell be handled by #if evaluation,
and removing the #define manually.
Re-add #include merging, and concatenation
Use -m/-v instead of -merge/-verbose etc., overhaul help output
-lzip: Remove #include guards manually