OOB Panic on specific arrangements of LuaJIT-style integer formats (LL/ULL)

[Lyrth]

Clue seems to support LuaJIT-style long integer literals (256ULL, -4LL, etc.), but parsing seems to trip up on certain arrangements of the literal. An example (newline included, works fine if EOF is immediately after ULL):

local a = 2ULL

panics with:

thread 'main' panicked at core\src\scanner.rs:180:18:
index out of bounds: the len is 14 but the index is 14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Different combinations of the lines before and after the usage produce odd results, and even LL's behavior is very different from ULL in terms of what panics or not. There seems to be no clear pattern on how the panic happens, so perhaps the method of parsing should be changed.

Here is a matrix of which arrangements error out (ones highlighted in red):

[Maiori44]

Turns out the issue was the scanner not reading ULL and LL properly.
It has been fixed in 4.0