Simplify recipe parsing and environment creation

This MR proposes a slightly different strategy for recipe parsing and environment creation that should get rid of most conflicts originating from a full dependence parsing.

Closes #70 (closed)

changed title from Issue 70 to Simplify recipe parsing and environment creation

changed the description

added 4 commits

• 5aefbc78...5837551f - 2 commits from branch master
• c0ea1876 - [build] Simplify recipe parsing and environment creation significantly and...
• 2e8853a8 - [build] Simplify recipe parsing and environment creation significantly and...

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enabled an automatic merge when the pipeline for 2e8853a8 succeeds

merged

mentioned in commit b7e1bcc8

mentioned in issue bob#269 (closed)