Restructuring

[Nima-Ra]

• [x] Write the standard. @Nima-Ra
• [x] Write the router canister and make it compatible with the standard. @Nima-Ra @miguelToscano
• [x] Write the template registry canister and make it compatible with the standard. @Nima-Ra
• [x] Make the canister registry compatible with the standard. @Nima-Ra
• [x] Update canister registry's upgrade script. @Nima-Ra
• [x] Make the token registry compatible with the standard. @Nima-Ra
• [x] Update token registry's upgrade script. @Nima-Ra
• [x] Make the NFT registry compatible with the standard. @miguelToscano
• [x] Update NFT registry's upgrade script. @miguelToscano
• [x] Update the router canister and add unit tests. @miguelToscano
• [x] Make DAB.js compatible with the standard and the new structure. @rocky-fleek
• [x] Document the changes. Warn the community about the deprecated methods. @Nima-Ra @nicolaspoggi
• [x] Test all of the canisters with upgrades and also try calling methods from DFX. @Nima-Ra [WIP]
• [x] Ask @qti3e and @jsonsivar for review.