[Lity] Update lity version for v1.2.8-pre

[Docs] Fix missing link of random number page

[Lity] Handle contract-standard option in StandardCompiler.

[Lity] Update changelog for v1.2.6 release.

[Lity] Update changelog for v1.2.5 release

[Docs] replace 'pragma solidity' with 'pragma lity'

[Lity] Update changelog for v1.2.3 hotfix release

[Lity] Update changelog for v1.2.2 release

[Lity] Update Changelog for v1.2.1 release

[Lity] Update Changelog for v1.2.0 release