fix mapmanip script and add docs/gitignore for generated maps (ParadiseSS13#28429)

Author: warriorstar-orion

.gitignore

@@ -78,3 +78,6 @@ rustlibs_panic.txt
 
 # mkdocs output.
 site
+
+# mapmanip-generated DMM files
+_maps/map_files/**/*.mapmanipout.dmm

docs/mapping/submaps.md

@@ -95,6 +95,16 @@ even whole layouts, making it so a map looks different every time it is visited.
 
     ![](./images/mapmanip_results.png)
 
+    Mapmanip can also generate permutations of your map at the command line, by
+    running:
+
+    ```sh
+    .\tools\rustlib_tools\mapmanip.ps1
+    ```
+
+    This will create a version of every map that has submaps and save them with
+    the suffix `mapmanipout.dmm`, wherever the original map is located.
+
 ## Areas and Turfs
 
 Areas and turfs, and specifically their "noop" types, have special meaning in

tools/rustlibs_tools/mapmanip.ps1

@@ -31,7 +31,7 @@ $BapiDllFunction = "all_mapmanip_configs_execute_ffi"
 $BapiExecutionTime = Measure-Command {
 	# `rundll` runs a function from a dll
 	# the very sad limitation is that it does not give any output from that function
-	rundll32.exe $BapiPath, $BapiDllFunction
+	rundll32.exe $BapiPath $BapiDllFunction
 }
 
 # done