Normalize paths before converting to url

This commit ensures to resolve any intermediate `/../` etc. and normalize case
of local file paths before converting to an URL, so something like

   C:\\\\www\\host\.\..\file.json

becomes:

  file:///c:/www/file.json

Author: deathaxe

package_control/commands/add_channel_command.py

@@ -3,7 +3,7 @@
 import sublime
 import sublime_plugin
 
-from os.path import isabs
+from os.path import isabs, normcase, normpath
 from urllib.request import pathname2url
 
 from ..console_write import console_write
@@ -45,7 +45,7 @@ def run(self, url=None, unattended=False):
                     )
                     return
 
-                url = "file:" + pathname2url(url)
+                url = "file:" + pathname2url(normcase(normpath(url)))
 
             settings = sublime.load_settings(pc_settings_filename())
             channels = settings.get('channels')

package_control/commands/add_repository_command.py

@@ -3,7 +3,7 @@
 import sublime
 import sublime_plugin
 
-from os.path import isabs
+from os.path import isabs, normcase, normpath
 from urllib.request import pathname2url
 
 from ..console_write import console_write
@@ -45,7 +45,7 @@ def run(self, url=None, unattended=False):
                     )
                     return
 
-                url = "file:" + pathname2url(url)
+                url = "file:" + pathname2url(normcase(normpath(url)))
 
             settings = sublime.load_settings(pc_settings_filename())
             repositories = settings.get('repositories')