File contexts

Because #includes can occur in the middle of input files, the lexer needs to push file contexts to a stack. File input buffer, macro expansion buffer and the token queue form a so-called "context". It is file specific and thus it must be pushed onto a stack, so that the lexer can return to the parent (after parsing an #include), without losing any tokens or macro text. Note that macros can contain #includes too.

fb.bas:fbIncludeFile() basically just consists of:

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