Make maintaining a fork easier

[Kylogias]

This pull request makes maintaining a fork generally easier. This includes

• adding 4 generated files to the .gitignore
• add some files to make clean that got missed before
• Remove the line for the git hash in rawdraw_sf.h (making it easier to keep a fork up-to-date by getting rid of merge conflicts from that line)

[cnlohr]

What mechanism can we use to identify the source of the rawdraw_sf.h? Is there some way we could do it where if it was generated from the official folder it would retain that information verses if it was from a local branch? Maybe make it so local branch outputs go to a different folder than the official one?

I.e. make a new folder, call it local/

Then, when anyone other than the github ci builds it, it builds rawdraw_sf.h and puts it into local/?

[Kylogias]

I couldn't figure out a way to keep the problematic line in rawdraw_sf.h and to not have it create conflicts, so I amended the commit to revert the removal of the line