Bump MAX_LENGTH constants in pelib to reflect what we see in the wild

[metthal]

We've ran into some samples which contain very long symbols which can be considered valid. There are however several MAX_LENGTH constants in PeLib which limit them to 96. It'd be the best to push these constants further so that we can realistically parse out what is possible but still with reasonable constraints (let's say 256, 384 or 512 in the worst case). They are all located in include/retdec/pelib/PeLibAux.h but try to look through the whole pelib folder to find other limit constants.

Sample for test: 1c9620c688d00703a5c535ffbd59f27f5f7da07b18ccb12aef480ac2c0222324