lazy-loading for template-parser modules:

* removed "hard coded" dependencies for parsers (i.e. removed from
module-definition's dependency-list)

* instead: load parsers only if templates actually need parsing (i.e. do
not load, if pre-compiled templates are used)

* WARNING: for classes/modules in mvc/** these dependencies have become
"hidden" -> depenendcies must be loaded beforehand, that is before they
are used/required within these modules (see comments in constructor
docu)