OpenSystemsDevelopment / qpdf

(except '\\' and '\uXXXX')

Reflect that the ls_number case only handles the digits after an 'e'.

Also, change state to ls_number for all 'ready' numbers.

Also, allow 'E' as alternative to 'e'.

Also. remove '.' as  starting char in lsTop.

Code tidy : replace 0 with nullptr or true