Generate multiple runtimes (#78)

* feat: preinitialize tUSD on Trappist parachain

Refers #44

* feat: add dex exchange to geneis block
Alice can exchange currency to assets

Refers #44

* Auto stash before merge of "44-defi-xcm-use-case-no1" and "master"

* Fix errors after merging master

* Edit README

* Bash file to build all runtimes

* Edit ticker, remove symlinks

* Fix build command

* Run cargo fmt

* Add missing feature for runtime benchmarks

* Add base runtime benchmarks

* cargo fmt

Co-authored-by: Daniel Bigos <[email protected]>
Co-authored-by: Steve Degosserie <[email protected]>