Support all text-based ctypes in store_loot

This patch will treat all text-based ctypes as human-readable text files, not always bin.

To test:

- [ ] Use auxiliary/scanner/smb/smb_enumshares
- [ ] Have a valid username/pass
- [ ] Set ```SpiderShares``` to true
- [ ] Set ```ShowFiles``` to true
- [ ] Set ```LogSpider``` to 1
- [ ] Run the module. It should list all the files found, and store the results with a store_loot as *.txt