Rename options["files"] to options["names"]

This is a 'breaking' change (though likely no impact).

Reasoning: we want the list of 'files' for a few things,
including upcoming tagging. It's not really a list of
files: they could be various things.

l3build-arguments.lua

@@ -122,7 +122,7 @@ option_list =
 -- termination (break)
 local function argparse()
   local result = { }
-  local files  = { }
+  local names  = { }
   local long_options =  { }
   local short_options = { }
   -- Turn long/short options into two lookup tables
@@ -150,11 +150,11 @@ local function argparse()
   end
   -- An auxiliary to grab all file names into a table
   local function remainder(num)
-    local files = { }
+    local names = { }
     for i = num, #arg do
-      table.insert(files, arg[i])
+      table.insert(names, arg[i])
     end
-    return files
+    return names
   end
   -- Examine all other arguments
   -- Use a while loop rather than for as this makes it easier
@@ -164,7 +164,7 @@ local function argparse()
     local a = arg[i]
     -- Terminate search for options
     if a == "--" then
-      files = remainder(i + 1)
+      names = remainder(i + 1)
       break
     end
     -- Look for optionals
@@ -232,12 +232,12 @@ local function argparse()
       i = i + 1
     end
     if not opt then
-      files = remainder(i)
+      names = remainder(i)
       break
     end
   end
-  if next(files) then
-   result["files"] = files
+  if next(names) then
+   result["names"] = names
   end
   return result
 end

l3build-stdmain.lua

@@ -46,7 +46,7 @@ end
 -- The overall main function
 --
 
-function stdmain(target, files)
+function stdmain(target, names)
   local errorlevel
   -- If the module name is empty, the script is running in a bundle:
   -- apart from ctan all of the targets are then just mappings
@@ -90,7 +90,7 @@ function stdmain(target, files)
     elseif target == "bundlectan" then
       errorlevel = bundlectan()
     elseif target == "doc" then
-      errorlevel = doc(files)
+      errorlevel = doc(names)
     elseif target == "check" then
       errorlevel = check(files)
     elseif target == "clean" then

l3build.dtx

@@ -1252,10 +1252,10 @@
 %     \midrule
 %       \var{date}        & String  \\
 %       \var{engine}      & Table   \\
-%       \var{files}       & Table   \\
 %       \var{force}       & Boolean \\
 %       \var{halt}        & Boolean \\
 %       \var{help}        & Boolean \\
+%       \var{names}       & Table   \\
 %       \var{pdf}         & Boolean \\
 %       \var{quiet}       & Boolean \\
 %       \var{rerun}       & Boolean \\

l3build.lua

@@ -71,7 +71,7 @@ main = main or stdmain
  
 -- When we have specific files to deal with, only use explicit configs
 -- (or just the std one)
-if options["files"] then
+if options["names"] then
   checkconfigs = options["config"] or {stdconfig}
 else 
   checkconfigs = options["config"] or checkconfigs
@@ -103,4 +103,4 @@ if #checkconfigs == 1 and
 end
 
 -- Call the main function
-main(options["target"], options["files"])
+main(options["target"], options["names"])