add catchall system & http pc server

- define a catchall name to run globally or per service
- catchall must be javascript, but not necessarily a .js file
- catchall can request async mode
- catchall will catch any non-existing requests under its directory
- see wtv-flashrom:/content/content-serve.js as an example, which will catch wtv-flashrom:/content/ URLs.

- http pc: sends HTTP/1.0 to PC clients
- can be disabled with `pc_server_hidden_service_enabled`: false
- can change servicevault path by changing string of pc_server_hidden_service
- get.js in default PC service vault to get any WTV Url on the service

zefie_wtvp_minisrv/config.json

@@ -14,8 +14,11 @@
     "post_percentages": [ 0, 25, 50, 100 ],
     "verbosity": 2,
     "error_log_file": "errors.log",
+    "catchall_file_name": "catchall.js",
     "enable_lzpf_compression": false,
     "enable_gzip_compression": true,
+    "pc_server_hidden_service": "http_pc",
+    "pc_server_hidden_service_enabled": false,
     "allow_guests": true
   },
   "services": {
@@ -53,7 +56,8 @@
       "flags": "0x00000040",
       "debug": false,
       "use_zefie_server": true,
-      "bf0app_default_rom": "content/artemis-webtv-000/build7181/daily-nondebug/bf0app-part000.rom"
+      "bf0app_default_rom": "content/artemis-webtv-000/build7181/daily-nondebug/bf0app-part000.rom",
+      "catchall_file_name": "content-serve.js"
     },
     "wtv-setup": {
       "port": 1613,