improve assets loader performance

- load less classes (optimized version for assets)
- exit setup ealier to load assets (to avoid session, https, prelogin etc)

improves performance of simple 1k image:
before: 300 req/sec
after: 600 req/sec

improves performance of 600k Frontend.js:
before: 130 req/sec
after: 220 req/sec
pass url to assets loader where baseUrl is already removed

and add update script that removes old asses loader call
improve setup for assets

- improve preloaded classes for assets output
- don't enable benchmarkLog
cache assets path for output
don't use include_path, instead use symlinks

small performance improvement as two file_get_contents and file_exists calls can be avoided
fix update script: create symlink correctly

also delete include_path file which is not needed anymore
Merge pull request #114 from nsams/3.5-assets-performance

improve assets output performance