fix: non-built default value should not move cursor to next

test 19-xset
doc of Echo
add mark functions
fix
fix
fix
from 023576d use v2 engine
warn to info for v1 engine
fix xptemplateTest.vim
autoload/xpt/flt.vim
autoload/xpt/ftsc.vim
autoload/xpt/group.vim
autoload/xpt/ng.vim
autoload/xpt/ph.vim
autoload/xpt/phfilter.vim
autoload/xpt/rctx.vim
autoload/xpt/render.vim
autoload/xpt/snip.vim
autoload/xpt/snipf.vim
autoload/xpt/snipfunc.vim