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Lowercase string tokens while tokenizing#21

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TomTheBear wants to merge 1 commit intobtmills:masterfrom
TomTheBear:use_lowercase_strings
Open

Lowercase string tokens while tokenizing#21
TomTheBear wants to merge 1 commit intobtmills:masterfrom
TomTheBear:use_lowercase_strings

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@TomTheBear
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This PR changes all letters to lowercase while parsing. This simplyfies the matching later for special floats (nan, NaN, ...) and functions (Sum, sum, SUM, ...).
I'm not sure whether this rule is too general and we should delay the case switching. I needs to be done latest before checking the token type and calling doFunc()

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