1215-eval-toplevel-to-cursor

[PEZ]

What has Changed?

1. Adding a command for evaluating the current top level form up to the cursor.
   • Binding it to shift+alt enter
2. Adding a command for evaluating from the start of the file to the cursor.
   • Binding it to ctrl+shift+alt enter

Fixes #1215

My Calva PR Checklist

I have:

• Read How to Contribute.
• Directed this pull request at the dev branch. (Or have specific reasons to target some other branch.)
• Made sure I have changed the PR base branch, so that it is not published. (Sorry for the nagging.)
• Updated the [Unreleased] entry in CHANGELOG.md, linking the issue(s) that the PR is addressing.
• Figured if anything about the fix warrants tests on Mac/Linux/Windows/Remote/Whatever, and either tested it there if so, or mentioned it in the PR.
• Added to or updated docs in this branch, if appropriate
• Tested the VSIX built from the PR (so, after you've submitted the PR). You'll find the artifacts by clicking Show all checks in the CI section of the PR page, and then Details on the ci/circleci: build test. NB: You need to sign in/up at Circle CI to find the Artifacts tab.
  • Tested the particular change
  • Figured if the change might have some side effects and tested those as well.
  • Smoke tested the extension as such.
• Referenced the issue I am fixing/addressing in a commit message for the pull request.
  • If I am fixing the issue, I have used GitHub's fixes/closes syntax
• Created the issue I am fixing/addressing, if it was not present.

Ping @bpringe