scriptish-local-hack.sh

Unless `extensions.scriptish.cache.enabled` [1] is `true`, Scriptish loads scripts from disk each time they are required. Linking the scripts in Scriptish profile directory into git tree allows easier development, it is not necessary to reinstall Wiki Monkey after each change.

[1]: https://github.com/scriptish/scriptish/wiki/Manual%3A-Preferences#wiki-boolean-extensionsscriptishcacheenabled--new-in-scriptish
scriptish-local-hack: use programmatic approach
scriptish-local-hack: safe_ln() is useless, it is already ensured that target exists
rename scriptish-local-hack.sh -> scriptish-dynamic-local-cache.sh
scriptish-dynamic-local-cache.sh: update header comments
ArchWikiNPFilter.js: respect list navigation links (fixes #159)
ArchWikiNPFilter: use native function for performance + remove debug message