Added a filter-parser which removes parse-paths that don't match a filter
Keywords are disallowed as identifiers
set braces
added todo list
todo added
introduced let-statement to language, exracted lambda-expression
lambda calls are now executed within the stack of the lambda def + arguments. Before it was done with the stack of the caller
prepared test for let statement
Single clause let-statement works
Multi clause let-statement works
changed faculty-test to use let statement
Added syntax for let statement