Quick overview of the call graph

Showing the recursion between the FB parser, the PP parser, and the lexer:


					+------------------> lexGetLookAhead() --------+
					|                                              |
					|                                              v
		 (begin)        (FB parsing)                (PP parsing)         (lexing)
		fbCompile()  ->  cProgram()  ------------>  lexSkipToken()  ->  lexNextToken()
			|               ^  |                       |     ^              |    ^
			v               |  |                       v     |              v    |
		   fbPreIncludes()  |  |('$include)       ppCheck()  |           ppDefineLoad()
				  |     |  |                       |     |          (macro expansion)
				  v     |  v                       v     |
				 fbIncludeFile()  <--------------  ppParse()
						(#include)    (directives)

