Add application category for OS X

The Applications folder in OS X is large and installers tend to expect apps to stay where they were placed (i.e. the root of /Applications). Since Lion, there's been application category metadata for View --> Arrange by Application Category but if the metadata's not in info.plist, the app gets sorted into "Other" at the bottom. 

https://developer.apple.com/library/Mac/releasenotes/General/SubmittingToMacAppStore/#//apple_ref/doc/uid/TP40010572-CH16-SW8 (this applies to all Mac apps, not just those installed through App Store).
If SelectedIf is in a list of Actions, it is uesd to check selected
If SensitiveIf is in a list of Actions, it is uesd to check sensitive
fix selected status in musicroom
autosave before load
reduce bgm volume during voice playing
Added Italian translations for launcher and template
Signed-off-by: huanxuantian <huanxuantian@msn.cn>
Chinese_Simplified translation for ren'py launcher
Created by huanxuantian
Translate by huanxuantian
Translation version 1.3.b
update to github on 2014-5-25 sun
Chinese_Simplified translation for ren'py launcher 1.3c release
orgin version：0.98a
current version：1.3c
least update date:2014-5-27
Fixed screens.rpy
Removed TODO and duplicates, added README.html
fix doc about LiveComposite
Fixed very minor typos
Properly encode unicode strings in exceptions.

Previously, if a non-ascii unicode string was in an exception,
we'd fail to encode the exception and crash.
fix doc about MoveTransition
Add the uses_scope property to Text.

This tells us if we need to update the text when the scope changes.
Merge pull request #379 from kyouryuukunn/fix_doc

fix doc about LiveComposite
Window show None should not use config.window_show_transition.

And similary for window hide None and config.window_hide_transition.

Fixes #381.
Prompt the user to back up their project.

Brought to you by citizens against data loss.
play sound / queue sound should respect loop parameters.

Fixes #378.