add : Strings.ToFloat

[BeckerStS]

Currently only Strings to any Integers are supported within this library ... which is btw. also covered by the @ax/system-strings library.
Adding additional string conversions like : STRING>(L)Real would be nice, since there is no such comfort function as of now.

add functions (if feasable) :

Strings.ToFloat (str : STRING, value => REAL) : BOOL;
Strings.ToFloat (str : STRING, value => LREAL) : BOOL;
Strings.ToFloat (str : WSTRING, value => REAL) : BOOL;
Strings.ToFloat (str : WSTRING, value => LREAL) : BOOL;