Fix signed char indexing in lexer punctuation table - #25
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Fixes #24
Punctuation bytes >= 0x80 can become negative when read through signed char. Casting that value directly to unsigned int produces an out-of-range index for the 256-entry punctuation table.
This changes the three punctuation-table accesses in idLexer::CreatePunctuationTable() to cast through unsigned char instead.
Tested on CachyOS x86_64 with GCC 16.2.1. Before the change, OpenPREY consistently crashed at Lexer.cpp:550 during declaration initialization. After the change, PREY launches successfully.