add cache to optimize pragma processing

[mattbruv]

Made it so the pragma script creates a .pragma cache folder where it saves the results of the assembly scraping as a key/value pair based on the function being imported for fast lookup.

Making changes to large files now doesn't take any more time than a tiny file. It's practically instant.

Running time python tools/inlineasm/globalasm.py -s src/Game/zEntPlayer.cp:

Without cache:

0:04.07 elapsed
0:03.76 elapsed
0:03.72 elapsed
0:03.69 elapsed
0:03.71 elapsed

With cache:

0:00.30 elapsed
0:00.26 elapsed
0:00.27 elapsed
0:00.28 elapsed
0:00.26 elapsed

Running make on the entire project from scratch takes about 2 minutes, and then cleaning and running make again with the pragma cache saves about 16 seconds of build time for me.