Support auto filename validation

[byzod]

Currently if a rename operation is invalid, massren do nothing and display error text

If possible, add an option like fix_invalid_filename

When it's false, massren works like what it is now

When it's true, fix common filename errors (maybe with more customizable setting like character used to replaced invalid characters)

For example

old name,   user's edit,   new name
---
1.h     1*.h     1_.h
2.h     1?.h     1_(1).h
3.h     2::2.h   2__2.h

---

Thanks for your repo!

I try to find application like this for years

BTW could you please update windows build to the lastest 1.4?

[byzod]

Managed to build it with go 1.17, donno how to compress tho so it's much bigger :/
Hope this would help other windows user
massren-1.5.3-win-x64.zip