hugolib, tpl: Get rid of some redundant viper calls

[n10v]

markdownify template function needs less time now to markdownify pages.

Count of viper calls by building https://github.com/rdwatters/hugo-docs-concept

 962 publishdir
 749 pygmentscodefences
 650 defaultcontentlanguage
 645 languages
 640 builddrafts
 638 buildfuture
 638 buildexpired
 342 ignorefiles
 315 hascjklanguage
 313 enableemoji
 261 rsslimit
 261 disablerss
   9 rssuri
   5 defaultContentLanguage
   4 uglyurls
   4 theme
   4 taxonomies
   4 multilingual
   4 ignorecache
   4 defaultcontentlanguageinsubdir
   4 canonifyurls
   4 cachedir
   4 baseurl
   3 workingdir
   3 themesdir
   3 staticdir
   3 removepathaccents
   3 paginatepath
   3 layoutdir
   3 disablepathtolower
   2 workingDir
   2 themesDir
   2 contentdir
   2 blackfriday
   1 verbose
   1 uglyURLs
   1 title
   1 staticDir
   1 social
   1 sitemap
   1 sectionpagesmenu
   1 removePathAccents
   1 relativeurls
   1 relativeURLs
   1 publishDir
   1 preservetaxonomynames
   1 pluralizelisttitles
   1 permalinks
   1 params
   1 paginatePath
   1 noTimes
   1 noChmod
   1 menu
   1 logFile
   1 layoutDir
   1 languagecode
   1 i18ndir
   1 googleanalytics
   1 footnotereturnlinkcontents
   1 footnoteanchorprefix
   1 footnoteReturnLinkContents
   1 footnoteAnchorPrefix
   1 enablerobotstxt
   1 enablemissingtranslationplaceholders
   1 enablegitinfo
   1 disqusshortname
   1 disablesitemap
   1 disablekinds
   1 disablehugogeneratorinject
   1 disablePathToLower
   1 disable404
   1 defaultContentLanguageInSubdir
   1 datadir
   1 copyright
   1 cleanDestinationDir
   1 canonifyURLs
   1 cacheDir
   1 baseURL
   1 author

Performance gain: about 0.5-1 sec by building hugodocs.info on my MacBook Air 2014/1,4 GHz Intel Core i5/4 GB 1600 MHz DDR3

Updates #2728
Updates rdwatters/hugo-docs-concept#44

@bep I appreciate if you will provide benchmarks

[bep]

In my tests it saves some allocations compared to current master, but is about the same in speed department (there is an error margin here at about 3 percent or something):

benchmark           old ns/op      new ns/op       delta
BenchmarkHugo-4     9997747579     10140845478     +1.43%

benchmark           old allocs     new allocs     delta
BenchmarkHugo-4     49446752       48760618       -1.39%

benchmark           old bytes      new bytes      delta
BenchmarkHugo-4     9442790920     9433569344     -0.10%

But I guess this depends on what feature the sites I have in my test uses.

[n10v]

Thank you!
Hm, then these changes only affect themes that use many markdownify functions

[bep]

This is, of course, still worth it. I will eventually update my list of sites in my benchmark to be more representative re new features.

[n10v]

So can I merge it?

[n10v]

Merged in 8f09e5f and 260b55e

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