all_pre.sh and all_post.sh on HTM files

directadmin.conf option for all_pre.sh and all_post.sh to be run with HTM files. It's off by default, so if you want all_pre/post.sh with HTM files, it would first have to be turned on. Option is:

htm_all_scripts=1

if you want it. It default to 0 internally (the option won't be present by default).

This will all creation of your own HTM pages with your own root run code in the all_pre.sh and all_post.sh if you want to create your own applications that need root access. A plugin could find this very handy. The plugin would have to add HTM pages to the skins/skinname/files_custom.conf to be safe from DA updates overwriting them. Each skin would need a files_custom.conf if they are all to have custom HTM pages.