- Move term type constants from TERM_* to Term::*
- Move term object type constants from TERM_OBJ_* to Term::OBJECT_TYPE_*
- Add Term::isType() method
- Add Strings::startsWith()  method

- Remove mod/register
- Remove REGISTER_* constants

- Update REGISTER_* constants definition
- Update register template variable name

- Add deprecated status

- Remove extraneous parentheses around empty() calls
- Remove duplicate calls to intval(), count() or strlen() after empty()
- Replace ternary operators outputting binary value with empty() return value
- Rewrite defaults() without x()

make changes based on review.

- Move infinite scroll data output in a module hook
- Use Pager instead of paginate() and alt_pager()

- Add DBA::NULL_DATE constant

- Replaced every CACHE definition
- Moved check_url to App->checkURL()
- Removed unused definition "ZCURL_TIMEOUT"

- Remove redundant System::baseUrl() in goaway() calls
- Add more generic Friendica\Model use statement
- Allow empty path in goaway()

- z_root() => $a->getBaseURL()
- absurl() => removed because no usage
- is_ajax() => $a->isAjax()
- current_load() => System::currentLoad()
- argc() => $a->argc
- argv($x) => $a->getArgumentValue($x)

- renamed a lot of App methods to CamelCase
- replaced direct public variables with get-/set-Methods

And extending Addon from BaseObject because of self::getApp()