Get things building on Raspberry Pi.

Right now, we can run Ren'Py, but at an unusably slow speed.
Make it easier to add EGL support.
Rename eg_gl to egl_none, since it's really used in cases where we're not managing egl.
Add raspberry pi and x11 egl modes.

The raspi one somewhat works (it has problems, such as positioning the
window in the wrong place), but the slowness of the raspi system make
using it problematic.

The x11 mode hasn't been tested.
Remove raspi stuff.
atl: Properly transfer child_st_offset, raw_child, and debug.

The major problem fixed here is one where if a transform was
replaced (like one in a screen would be), it would not know that
the old child was being shown. This would prevent the
"<displayable> with <transition>" ATL construct from doing
anything.

Fixes #340.
Do not backup / restore flag singletons.

The reload backup process would back up singletons, but not functions
and methods that used those singletons as default arguments. The
result was that the singletons would change identity, but not
the default arguments - and the code using them would fail in
odd ways.

An example problem this caused is
http://lemmasoft.renai.us/forums/viewtopic.php?p=320775#p320757 .
update japanese_template
update the japanese translation for launcher
Merge pull request #343 from kyouryuukunn/update_japanese_template

Update japanese template