treewide: Fix indentation in strings

The indentation stripping semantics of strings are fairly bad and have a
few gotchas where the resulting string has not the intended indentation.
This commit fixes most if not all such instances in Nixpkgs.

I tried to strive a balance between keeping the diff small and
reformatting/refactoring the code to look better. In general,
reformatting should be left to Nixfmt.

Note that this causes a lot of rebuilds by design. All changes need to
be thoroughly vetted and reviewed for correctness. There is no automatic
way to prove correctness.

List of files to fix generated by running
https://gerrit.lix.systems/c/lix/+/2092 on Nixpkgs and looking at the
warnings.

pkgs/development/libraries/java/rhino/default.nix

@@ -44,11 +44,11 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Implementation of JavaScript written in Java";
 
-    longDescription =
-      '' Rhino is an open-source implementation of JavaScript written
-         entirely in Java.  It is typically embedded into Java applications
-         to provide scripting to end users.
-      '';
+    longDescription = ''
+      Rhino is an open-source implementation of JavaScript written
+      entirely in Java.  It is typically embedded into Java applications
+      to provide scripting to end users.
+    '';
 
     homepage = "http://www.mozilla.org/rhino/";