FBO depth rendering changed to use teexture
small cleanup
Use GL_DEPTH_COMPONENT16
f_id in fbo creation to 0
uix:ActionBar make items added to ActionOverflow persistant in the
overflow dropdown. Minor bug fixes.
uix:Settings fix handeling of numeric input, no body had a issue with
this??
doc: added some explanation to AsyncImage to completeness
Merge pull request #1400 from Zen-CODE/async

doc: added some explanation to AsyncImage for completeness
Use Vertex Shader as well

Not tested with vs=None.  "Works for me"
Cleanup the code related to using depth texture
Merge pull request #1345 from nskrypnik/3dpicking

#1344 issue resolving(3d picking)
uix:ActionBar fix group_index to be calculated after all groups have
been added
doc: revisions to effects/__init__.py
doc: added docstring to effects/opacityscroll.py so the linking works
uix:ActionBar allow changing of proeprties like color, mipmap, border
through the ActionItem.
uix:TabbedPanel introduce new `strip_image` and `strip_border`
properties that can be used to easily  customize Tab strip.
lang: allow _ to be checked as it was a key.value property.
Change license from LGPL 3 to MIT
remove license header
doc: revisions to effects/scroll.py