Add setting to optionally show commit body inline in graph#25

Pwuts wants to merge 4 commits intogit-hub-tig:mastergit-hub-tig/vscode-git-graph:masterfrom

Pwuts:fix/show-commit-body-inline-settingPwuts/vscode-git-graph:fix/show-commit-body-inline-settingCopy head branch name to clipboard