softened differences in waterlily colors
Take time_speed into account
when setting spawning and growing ABM intervals.

also, add some basic sanity checks to the interval value just in case
the math comes out wrong.  Rearranged a bit of code to accommodate these
changes.
Merge branch 'master' of github.com:VanessaE/plantlife
also add farming as an opt depend for bushes_classic
Make most plants capable of waving if shaders are enabled
removed waving effect in grass, as the shader that provides it is about to
change in such a way that it will break what was here.
make poison ivy and jungle grass wave if the appropriate shader is enabled
totally remove jungle grass mod from this modpack and alias its nodes to air
this mod is simply no longer useful in modern minetest systems and causes too
much lag anyway.  The code of course will still remain available via git
history if someone wants it.
local-ize a couple of variables
Merge remote-tracking branch 'upstream/master'