NLA Editor: Added dedicated icons for "pushdown" operator and for indicating the "tweaking" state

1) The "pushdown" operation is the actual name for the functionality
   previously represented by the snowflake. That is, pushing the active
   action onto the NLA stack as a new strip.

   The icon that is introduced here is the icon I originally wanted to
   use here for this purpose (but couldn't at the time the NLA was coded
   as we didn't have the master SVG available yet). I'm making this change
   now to hopefully make the "animation-layers" intentions behind the NLA
   design a lot clearer than they have been so far.

2) Also added a dedicated icon for representing that the active action
   is in the "tweaking" state (i.e. we're editing a particular strip's
   action). Previously we were abusing an icon designed for an entirely
   different purpose, mainly since its identifier looked like it would work.

5 files changed, 370 insertions, 5 deletions

diff --git a/release/datafiles/blender_icons.svg b/release/datafiles/blender_icons.svg
index 6ebba80bbb2..7557b81c804 100644
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diff --git a/release/datafiles/blender_icons16/icon16_action_tweak.dat b/release/datafiles/blender_icons16/icon16_action_tweak.dat
new file mode 100644
index 00000000000..d2d1ec853d1
--- /dev/null
+++ b/release/datafiles/blender_icons16/icon16_action_tweak.dat
diff --git a/release/datafiles/blender_icons16/icon16_nla_pushdown.dat b/release/datafiles/blender_icons16/icon16_nla_pushdown.dat
new file mode 100644
index 00000000000..37e5cacb333
--- /dev/null
+++ b/release/datafiles/blender_icons16/icon16_nla_pushdown.dat
diff --git a/release/datafiles/blender_icons32/icon32_action_tweak.dat b/release/datafiles/blender_icons32/icon32_action_tweak.dat
new file mode 100644
index 00000000000..140e5a3f8be
--- /dev/null
+++ b/release/datafiles/blender_icons32/icon32_action_tweak.dat
diff --git a/release/datafiles/blender_icons32/icon32_nla_pushdown.dat b/release/datafiles/blender_icons32/icon32_nla_pushdown.dat
new file mode 100644
index 00000000000..83216ac5367
--- /dev/null
+++ b/release/datafiles/blender_icons32/icon32_nla_pushdown.dat