The `tmp/` path was hardcoded everywhere, which resulted in using `SettingsPiwik::rewriteTmpPathWithInstanceId()` to rewrite it for specific use cases.

I've moved that path into the config, and replaced all hardcoded usage (and calls to `rewriteTmpPathWithInstanceId()`) by a `get()` from the container.

Getting entries from the container is a bad practice and dependency injection should be preferred, but we do baby steps. When refactoring those classes to DI, we'll replace calls to the container with proper dependency injection.
Another thing we'll need to do too is move the hardcoded *sub-path* of `tmp/` (e.g. `tmp/sessions/`) into the config also (but again: baby steps).

Another future step would be to remove completely instance ID and let it be handled by a plugin (or by end-user config). Having the `tmp/` path in the config means that plugins or users can override it and know it will be taken into account everywhere in Piwik.

refs #6417 this should fix some tests. Start initial value by 0 so first generated id will be 1

fix omnifixture creation was broken

refs #6417 wondering if omnifixture creation worked

refs #6417 acquire a lock per archive id which should be better

refs #6417 we have to generate the SQL in the update itself otherwise the update would fail at some point in the future if the tables signature changes

refs #6417 split updates into a separate update file otherwise it would not be executed for devs using Piwik from git

refs #6417 added some documentation

refs #6417 Piwik 2.9.0-b2 was released meaning we have to move it to b3

refs #6417 Piwik 2.9.0-b3 was released meaning we have to move it to b4

Fixes #6068, correctly decode JSON encoded ec_items query parameter values so escaped HTML is properly handled by tracker. Includes tests and a separate fix to tests:run command (command fails when --options is used w/ a group argument).

Extracted `Piwik::getJavascriptCode()` into a separate, non static class: `Piwik\Tracker\TrackerCodeGenerator`

`Piwik::getJavascriptCode()` is now deprecated in favor of the new class.

refs #5940 moved files into a subfolder framework, added autoloader to remove duplicated code to load autoload.php and to be able to register more autoloaders (eg for test files) on demand. This I got read of many includes that had to be updated all the time and that had to be updated all the time when moving iles

#6085 Removed $GLOBALS['PIWIK_TRACKER_DEBUG_FORCE_SCHEDULED_TASKS'] and replaced it with DEBUG_FORCE_SCHEDULED_TASKS

refs #5940 we might stay backwards compatible this way for 2 months. moved some tests from unit to integration and explained when a test is a unit test, an integration test or a system test.