add autoload and refine vim snippets
fix
fix
add 19-xset
fix: non-built default value should not move cursor to next

test 19-xset
fix 19-xset
add 15-snip-cont
fix 19-xset
40-snip-include
60-ph-func-BuildIfNoChange
doc of Echo
ftplugin/go
flt.vim
add checkout-all-remote
Merge branch 'internal' into mix
Merge branches 'f.build', 'f.cases', 'f.conf', 'f.doc', 'f.docindex', 'f.engine', 'f.eval', 'f.filter', 'f.indent', 'f.log', 'f.once', 'f.parser', 'f.priority', 'f.pum', 'f.readme', 'f.replace', 'f.snipfunc', 'f.snpt', 'f.syntax', 'f.test', 'f.unittest', 'f.util', 't.sniptest', 'snp.cond-c', 'snp.cpp', 'snp.eruby', 'snp.go', 'snp.html', 'snp.htmldjango', 'snp.objc', 'snp.php' and 'snp.vim' into mix
update doc