Document NoRollback.
Ignore errors in OpenDirectory.
Document renpy.map_event.
Document NoRollback as class, not function.
More documentation and flagging as undocumented.
Add FileCurrentScreenshot.

This is a displayable that accesses the screenshot stored by
FileTakeScreenshot or ShowMenu.

Fixes #253.
Fix delete the tmp directory
Merge pull request #257 from LuqueDaniel/fix-rmtree

Fix delete the tmp directory
Add an alternate action to Button.

On devices that support it, an alternate action is triggered by
right-click.
Invoke the alternate action on longpress.
When ignoring a touch, move the "mouse" offscreen.

This will cause any focused button to lose focus until the user
touches the screen again.
Document alternate.
Fix typo that broke Android.

We copied script_version.rpy onto script_version.rpyc, which
made things fail to start on Android.
Report NO_RAPT before NO_JDK.

On Windows, RAPT is responsible for detecting the JDK. If RAPT is
missing, the JDK will also be reported missing - even if it's
installed.

Changing the reporting order makes this less confusing.
Fix sense of environment-encoding test.
fix typo
Merge pull request #259 from kyouryuukunn/fix_doc

fix typo
Add the pixel_width property to input.

This allows one to limit the width of an input field to a certain
number of pixels.

Fixes #254.
Fix documentation.

Thanks to Koichi Akabe for the proofreading.
fix typos