Replace "angband" with "sil" or "sil-q" as appropriate

I have been playing sil off and on for just a couple years, more off than on. My understanding is that it's somewhat of a fork of angband, and so descends from the angband source code. At this point, I believe the games have diverged so significantly, that it might be useful to "cut ties" in some sense.

For example, rename src/angband.h to src/sil.h

Of course, this will have wide range of ripple effects. I am (tentatively) willing to put some effort into this, as far as creating a PR or long-lived branch. I can understand that this can hamper some things, like historical source comparisons, or trying to apply patches from pre-rename to post-rename.

Anyway, just thought I would throw it out there and see what you think.

[rwh@nixos:~/git/sil-q/msvc2022]$ git grep -i angband
sil-q.vcxproj:    <ClInclude Include="..\src\angband.h" />
sil-q.vcxproj.filters:    <ClInclude Include="..\src\angband.h">

[rwh@nixos:~/git/sil-q/Sil.xcodeproj]$ git grep -i angband
half.mode1:             <string>/Users/half/Dev/Angband/Sil/Sil.xcodeproj</string>
half.pbxuser:           path = /Users/half/Dev/Angband/Sil/Sil.app;
project.pbxproj:                076939FF276F9BC400BD6EBD /* angband.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = angband.h; path = src/angband.h; sourceTree = "<group>"; };
project.pbxproj:                                076939FF276F9BC400BD6EBD /* angband.h */,
Binary file project.xcworkspace/xcuserdata/half.xcuserdatad/UserInterfaceState.xcuserstate matches

[rwh@nixos:~/git/sil-q/lib]$ git grep -i angband | wc -l
70

[rwh@nixos:~/git/sil-q/src]$ git grep -i angband | wc -l
1517

Many of these references do not need to be changed under this proposal, as they are not remnants from the prior project but rather references to Angband itself, as a separate project.

sil-quirk / sil-q

Replace "angband" with "sil" or "sil-q" as appropriate #109